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LPWA Module Series

BC950N-N1 Hardware Design

Application Interfaces

3.1. General Description

BC950N-N1 is equipped with a total of 94 pins, including 54 LCC pins and 40 LGA pins. The subsequent

chapters will provide detailed descriptions of the following functions/pins/interfaces:



PSM



Power Supply



PWRKEY



RESET



USB Interface



UART Interfaces



USIM Interface



ADC Interface*



RI Behaviors



Network Status Indication



Bluetooth Interface*

“*” means under development.

NOTE

BC950N-N1_Hardware_Design 13 / 59

Summary of Contents for BC950N-N1

Page 1: ...BC950N N1 Hardware Design LPWA Module Series Rev BC950N N1_Hardware_Design_V1 0 Date 2019 06 14 Status Preliminary www quectel com ...

Page 2: ...TOMERS REQUIREMENTS QUECTEL MAKES EVERY EFFORT TO ENSURE THE QUALITY OF THE INFORMATION IT MAKES AVAILABLE QUECTEL DOES NOT MAKE ANY WARRANTY AS TO THE INFORMATION CONTAINED HEREIN AND DOES NOT ACCEPT ANY LIABILITY FOR ANY INJURY LOSS OR DAMAGE OF ANY KIND INCURRED BY USE OF OR RELIANCE UPON THE INFORMATION ALL INFORMATION SUPPLIED HEREIN IS SUBJECT TO CHANGE WITHOUT PRIOR NOTICE COPYRIGHT THE INF...

Page 3: ...LPWA Module Series BC950N N1 Hardware Design About the Document History Revision Date Author Description 1 0 2019 06 14 Ostrovsky WEI Newgate HUA Scofield ZHANG Initial BC950N N1_Hardware_Design 2 59 ...

Page 4: ... NB IoT 19 3 4 2 Deep Sleep Mode 20 3 4 3 Operating Modes of Bluetooth 22 3 5 Power Supply 22 3 5 1 Power Supply Pins 22 3 5 2 Reference Design for Power Supply 23 3 6 Power up Power Down Scenarios 24 3 6 1 Power up 24 3 6 2 Power Down 25 3 6 3 Reset the Module 26 3 7 USB Interface 27 3 8 UART Interfaces 29 3 8 1 Main UART Port 30 3 8 2 Debug UART Port 30 3 8 3 Auxiliary UART Port 31 3 8 4 Bluetoo...

Page 5: ...llation 45 5 Electrical and Reliability Characteristics 47 5 1 Operation and Storage Temperatures 47 5 2 Current Consumption 47 5 3 Electrostatic Discharge 48 6 Mechanical Dimensions 49 6 1 Mechanical Dimensions of the Module 49 6 2 Recommended Footprint 51 6 3 Top and Bottom Views of the Module 52 7 Storage Manufacturing and Packaging 53 7 1 Storage 53 7 2 Manufacturing and Soldering 54 7 3 Packa...

Page 6: ... USIM INTERFACE 34 TABLE 14 PIN DEFINITION OF ADC INTERFACE 35 TABLE 15 RI SIGNAL STATUS 36 TABLE 16 MODULE STATUS INDICATED BY NETLIGHT 37 TABLE 17 PIN DEFINITION OF NB IOT BT ANTENNA INTERFACE 38 TABLE 18 MODULE OPERATING FREQUENCIES 38 TABLE 19 ANTENNA CABLE INSERTION LOSS REQUIREMENTS 42 TABLE 20 REQUIRED ANTENNA PARAMETERS 42 TABLE 21 RF CONDUCTED OUTPUT POWER 43 TABLE 22 RECEIVING SENSITIVIT...

Page 7: ...GN OF BLUETOOTH UART PORT 31 FIGURE 19 REFERENCE CIRCUIT WITH VOLTAGE LEVEL TRANSLATOR CHIP 32 FIGURE 20 REFERENCE CIRCUIT WITH TRANSISTOR CIRCUIT 32 FIGURE 21 SKETCH MAP FOR RS 232 INTERFACE MATCH 33 FIGURE 22 REFERENCE CIRCUIT FOR USIM INTERFACE WITH A 6 PIN USIM CARD CONNECTOR 34 FIGURE 23 BEHAVIORS OF RI WHEN A URC OR SMS MESSAGE IS RECEIVED 36 FIGURE 24 REFERENCE DESIGN OF NETLIGHT 37 FIGURE ...

Page 8: ...e connected with the customers applications This document can help customers quickly understand module interface specifications electrical and mechanical details as well as other related information of the module Associated with application notes and user guides customers can use BC950N N1 to design and set up mobile applications easily BC950N N1_Hardware_Design 7 59 ...

Page 9: ...or more restrictions on the use of wireless devices on boarding the aircraft Wireless devices may cause interference on sensitive medical equipment so please be aware of the restrictions on the use of wireless devices when in hospitals clinics or other healthcare facilities Cellular terminals or mobiles operating over radio signals and cellular network cannot be guaranteed to connect in all possib...

Page 10: ...vity with the applications BC950N N1 provides abundant external interfaces UART USB ADC NETLIGHT etc and protocol stacks UDP TCP LwM2M MQTT etc offering great convenience for customers applications Featuring compact form factor ultra low power consumption and extended temperature range BC950N N1 is a best choice for a wide range of IoT applications such as smart metering bike sharing smart wearabl...

Page 11: ...T Port Used for AT command communication data transmission and firmware upgrade By default the module is in auto baud mode and it supports automatic baud rates not exceeding 115200bps When powering on the module the MCU has to send AT command consecutively to synchronize baud rate with the module When OK is returned it indicates the baud rate has been synchronized successfully When the module is w...

Page 12: ...d illustrates the major functional parts Radio frequency Bluetooth Baseband Power management Peripheral interfaces SMS Text PDU mode Data Transmission Features Single tone 25 5kbps DL 16 7kbps UL Multi tone 25 5kbps DL 62 5kbps UL AT Commands 3GPP TS 27 005 3GPP TS 27 007 AT commands 3GPP Rel 13 and Quectel enhanced AT commands Firmware Update Upgrade firmware via main UART port or DFOTA or USB Re...

Page 13: ...uetooth XO 32MHz XTAL BT_ANT UART_BT GPIO1 4_BT RESET_BT VCC_BT SWD_BT Switch Enable LDO IO Domain Enable Figure 1 Functional Diagram means under development 2 4 Development Board Quectel provides a complete set of development tools to facilitate the use and testing of BC950N N1 module The development tool kit includes TE B board USB cable antenna and other peripherals For more details please refe...

Page 14: ...luding 54 LCC pins and 40 LGA pins The subsequent chapters will provide detailed descriptions of the following functions pins interfaces PSM Power Supply PWRKEY RESET USB Interface UART Interfaces USIM Interface ADC Interface RI Behaviors Network Status Indication Bluetooth Interface means under development NOTE BC950N N1_Hardware_Design 13 59 ...

Page 15: ...9 79 60 80 90 70 89 69 88 68 87 67 86 66 85 65 74 73 94 93 72 71 92 91 81 82 61 62 83 84 63 64 RXD_AUX TXD_AUX USB_3V3 USB_DM USB_DP RESERVED 1 16 28 43 GND RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED GND RESERVED RESERVED CTS_AUX RTS_AUX USB_MO DE RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED GND GND RESERVED GND GND GND GND GND GND GND GND GND RESERVE...

Page 16: ... Pin Name Pin No I O Description DC Characteristics Comment VBAT 45 46 PI Power supply for the module Vmax 4 6V Vmin 3 4V Vnorm 3 8V VDD_ EXT 26 PO 3 0V output power supply Vnorm 3 0V No voltage output in PSM mode It is intended to supply power for the module s pull up circuits and is thus not recommended to be used as the power supply for external circuits VCC_BT 1 PI Power supply for the Bluetoo...

Page 17: ...I Reset the module Active low PSM_EINT Interface Pin Name Pin No I O Description DC Characteristics Comment PSM_EINT 27 DI Dedicated external interrupt pin Used to wake up the module from PSM Network Status Indication Pin Name Pin No I O Description DC Characteristics Comment NETLIGHT 18 DO Network status indication ADC Interface Pin Name Pin No I O Description DC Characteristics Comment ADC 21 AI...

Page 18: ..._DBG 19 DI Receive data 3 0V power domain TXD_DBG 20 DO Transmit data Ringing Signal Pin Name Pin No I O Description DC Characteristics Comment RI 34 DO Ring indication signal 3 0V power domain USIM Interface Pin Name Pin No I O Description DC Characteristics Comment SIM_VDD 38 DO USIM card power supply Vnorm 1 8V 3 0V SIM_RST 39 DO USIM card reset signal VOLmax 0 15 SIM_VDD VOHmin 0 85 SIM_VDD SI...

Page 19: ...Suspended or pulled up 10KΩ resistor to 3 3V for normal boot mode USB_3V3 85 PI USB power supply Vnorm 3 3V USB_DP 87 IO USB differential data Conform to USB 1 1 specifications Request 90 Ω differential impedance USB_DM 86 IO USB differential data Bluetooth Interface Pin Name Pin No I O Description DC Characteristics Comment VCC_BT 1 PI Bluetooth power supply Vnorm 1 7V 3 6V SWDIO_ BT 3 IO SWD Dat...

Page 20: ... Table 5 Operating Mode of AP pin GPIO1_BT GPIO2_BT GPIO3_BT GPIO4_BT 75 76 78 79 IO Reserved Pins Pin Name Pin No I O Description DC Characteristics Comment RESERVED 10 13 16 17 22 25 28 31 33 35 37 44 49 50 67 70 80 84 89 91 Reserved Keep these pins unconnected Mode Features Operating Mode Normal Working state in Normal mode AP is processing tasks such as AT command interaction etc Idle Idle sta...

Page 21: ...M Power saving state modem is in disconnected state and cannot receive downlink data In this mode modem can be switched to Connected mode Mode Features Operating Mode Active Wake up state When AP is in Normal mode or modem is in Connected mode module is in Active mode In this mode all services can be processed normally and power consumption reaches the highest level Light Sleep Light sleep state W...

Page 22: ...mer expires the modem enters into PSM for duration of T3412 periodic TAU timer Please note that the modem cannot request PSM when it is establishing an emergency attachment or initializing the PDN Public Data Network connection When the modem is in PSM it cannot be paged and stops access stratum activities such as cell reselection but T3412 is still active Either of the following methods can make ...

Page 23: ...eep Sleep The module cannot be woken up by any other general purpose GPIO interrupts 3 4 3 Operating Modes of Bluetooth TBD 3 5 Power Supply 3 5 1 Power Supply Pins BC950N N1 provides two VBAT pins for connection with an external power supply The table below describes the module s VBAT and ground pins Table 8 Power Supply Pins Pin Name Pin No Description Min Typ Max Unit VBAT 45 46 Power supply fo...

Page 24: ...ower performance it is recommended to place a 100uF tantalum capacitor with low ESR ESR 0 7Ω and three ceramic capacitors 100nF 100pF and 22pF near the VBAT pins Also it is recommended to add a TVS diode on the VBAT trace near VBAT pins to improve surge voltage withstand capability In principle the longer the VBAT trace is the wider it should be A reference circuit for power supply is illustrated ...

Page 25: ...RKEY A simple reference circuit is illustrated in the following figure Turn on pulse PWRKEY 4 7K 47K Figure 6 Turn on the Module Using Driving Circuit Another way to control the PWRKEY is using a button directly When pressing the key electrostatic strike may generate from the finger Therefore a TVS component is indispensable to be placed nearby the button for ESD protection A reference circuit is ...

Page 26: ...Deep Sleep 3 6 2 Power Down BC950N N1 can be powered off though any of the following methods Power off by AT QPOWD 0 In emergent conditions the module can be powered off through disconnecting VBAT power supply The module will be powered off automatically when VBAT drops below 3 4V TBD VBAT VDD_EXT RUNNING OFF Module Status AT QPOWD 0 1 02s Figure 9 Power Down Timing Power Down by AT Command NOTE B...

Page 27: ...ge for at least 50ms will reset the module Table 10 Reset Pin Pin Name Pin No Description Reset Pull down Time RESET 15 Reset the module Active low 50ms The recommended circuits of resetting the module are shown below An open drain collector driver or button can be used to control the RESET pin Reset pulse RESET 4 7K 47K Figure 11 Reference Circuit of RESET by Using Driving Circuit BC950N N1_Hardw...

Page 28: ...Running RESET Restart 50ms VDD_EXT Figure 13 Reset Timing 3 7 USB Interface The USB interface of BC950N N1 module conforms to USB 1 1 specifications and supports full speed 12Mbps mode The interface can be used for software debugging and software upgrading and supports USB serial driver under Windows Linux operating systems The following table is the pin definition of USB interface BC950N N1_Hardw...

Page 29: ...ve signal traces It is important to route the USB differential traces in inner layer with ground shielding on not only upper and lower layers but also right and left sides Pay attention to the influence of junction capacitance of ESD protection components on USB data lines Typically the capacitance value should be less than 3pF Keep the ESD protection components as close to the USB connector as po...

Page 30: ... DCE DTE Data Terminal Equipment connection Table 12 Pin Definition of UART Interfaces Interface Pin Name Pin No Description Comment Main UART Port RXD 29 Receive data from TXD of DTE 3 0V power domain TXD 30 Send data to RXD of DTE Debug UART Port RXD_DBG 19 Receive data from TXD of DTE TXD_DBG 20 Send data to RXD of DTE Auxiliary UART Port RXD_AUX 55 Receive data from TXD of DTE TXD_AUX 56 Send ...

Page 31: ...ate with the module When OK is returned it indicates the baud rate has been synchronized successfully When the module is woken up from PSM or idle mode the baud rate synchronized during start up will be used directly When the port is used for firmware upgrade the baud rate is 921600bps by default The figure below shows the connection between DCE and DTE TXD RXD TXD RXD Module DCE Serial port Main ...

Page 32: ...cation with DTE It also supports log output for firmware debugging and hardware flow control Its baud rate is 115200bps by default The following is a reference design of auxiliary UART port DTE TXD RXD GND Module TXD_AUX RXD_AUX GND Figure 17 Reference Design of Auxiliary UART Port 3 8 4 Bluetooth UART Port TBD DTE TXD RXD GND Module TXD_BT RXD_BT GND Figure 18 Reference Design of Bluetooth UART P...

Page 33: ...X 51K 51K 0 1uF 0 1uF TXD RXD TXD_DBG RXD_AUX RXD_DBG TXD_AUX VDD Translator RI GPIO Module DTE GND GND Figure 19 Reference Circuit with Voltage Level Translator Chip Another example with transistor translation circuit is shown as below The circuit design of dotted line section can refer to the design of solid line section in terms of both module input and output circuit designs but please pay att...

Page 34: ...hifter 1 8V 3 3V Figure 21 Sketch Map for RS 232 Interface Match Please visit vendors websites to select a suitable RS 232 transceiver such as http www exar com and http www maximintegrated com 1 Transistor circuit solution is not suitable for applications with high baud rates exceeding 460Kbps 2 represents the test point of UART interfaces It is also recommended to reserve the test points of VBAT...

Page 35: ...rder to enhance the reliability and availability of USIM card in application please follow the criteria below in USIM circuit design Keep the placement of USIM card connector as close as possible to the module Keep the trace length as less than 200mm as possible Keep USIM card signals away from RF and VBAT traces Assure the trace between the ground of module and that of USIM card connector is shor...

Page 36: ...vice first and then to the module The 22Ω resistors should be connected in series between the module and the USIM card connector so as to suppress EMI spurious transmission and enhance ESD protection Please note that the USIM peripheral circuit should be close to the USIM card connector Place the RF bypass capacitors 33pF close to the USIM card connector on all signal traces to improve EMI suppres...

Page 37: ...lse first and then changes to high level and starts data output URC When URC is incoming RI outputs 120ms low pulse first and then changes to high level and starts data output RI HIGH LOW idle 120ms A URC or SMS me ssage is received Output data Figure 23 Behaviors of RI When a URC or SMS Message is Received 3 12 Bluetooth Interface Bluetooth interface is used for Bluetooth wireless network communi...

Page 38: ...cated by NETLIGHT Table 16 Module Status Indicated by NETLIGHT A reference circuit is shown as below Module NETLIGHT 4 7K 47K 2 2K VBAT Figure 24 Reference Design of NETLIGHT NETLIGHT Level Module Status Always Low LED OFF The module is not working or in Deep Sleep mode 64ms High LED ON 800ms Low LED OFF Network searching 64ms High LED ON 2000ms Low LED OFF Network connected BC950N N1_Hardware_Des...

Page 39: ... IoT BT Antenna Interface means under development 4 2 Operating Frequencies Table 18 Module Operating Frequencies Pin Name Pin No Description RF_ANT 53 RF antenna interface BT_ANT 8 BT antenna interface GND 52 54 7 9 Ground Frequency Band Receiving Frequency Transmitting Frequency B1 2110MHz 2170MHz 1920MHz 1980MHz B2 1930MHz 1990MHz 1850MHz 1910MHz B3 1805MHz 1880MHz 1710MHz 1785MHz NOTE BC950N N...

Page 40: ... place the π type matching components R1 C1 C2 as close to the antenna as possible By default the capacitors C1 C2 are not mounted and a 0Ω resistor is mounted on R1 A reference design of the RF interface is shown as below B4 2110MHz 2155MHz 1710MHz 1755MHz B5 869MHz 894MHz 824MHz 849MHz B8 925MHz 960MHz 880MHz 915 MHz B12 729MHz 746MHz 699MHz 716MHz B13 746MHz 756MHz 777MHz 787MHz B17 734MHz 746M...

Page 41: ...y the trace width W the materials dielectric constant the height between signal layer and reference ground H and the clearance between RF trace and ground S Microstrip line or coplanar waveguide line is typically used in RF layout for characteristic impedance control The following are reference designs of microstrip line or coplanar waveguide line with different PCB structures Figure 26 Microstrip...

Page 42: ... designed as thermal relief pads and should be fully connected to ground The distance between the RF pins and the RF connector should be as short as possible and all the right angle traces should be changed to curved ones There should be clearance area under the signal pin of the antenna connector or solder joint The reference ground of RF traces should be complete Meanwhile adding some ground via...

Page 43: ...nts on NB IoT antenna Table 19 Antenna Cable Insertion Loss Requirements Band Requirements LTE B5 B8 B12 B13 B17 B18 B19 B20 B26 B28 B31 Cable Insertion loss 1dB LTE B1 B2 B3 B4 B25 B66 Cable Insertion loss 1 5dB Table 20 Required Antenna Parameters Parameters Requirements Frequency Range 452MHz 2200MHz VSWR 2 Efficiency 30 Max Input Power W 50 Input Impedance Ω 50 BC950N N1_Hardware_Design 42 59 ...

Page 44: ...d Max Min B1 23dBm 2dB 39dBm B2 23dBm 2dB 39dBm B3 23dBm 2dB 39dBm B4 23dBm 2dB 39dBm B5 23dBm 2dB 39dBm B8 23dBm 2dB 39dBm B12 23dBm 2dB 39dBm B13 23dBm 2dB 39dBm B17 23dBm 2dB 39dBm B18 23dBm 2dB 39dBm B19 23dBm 2dB 39dBm B20 23dBm 2dB 39dBm B25 23dBm 2dB 39dBm B26 23dBm 2dB 39dBm B28 23dBm 2dB 39dBm B31 23dBm 2dB 39dBm B66 23dBm 2dB 39dBm NOTE BC950N N1_Hardware_Design 43 59 ...

Page 45: ...ving Sensitivity with RF Retransmissions Frequency Band Receiving Sensitivity B1 129dBm B2 129dBm B3 129dBm B4 129dBm B5 129dBm B8 129dBm B12 129dBm B13 129dBm B17 129dBm B18 129dBm B19 129dBm B20 129dBm B25 129dBm B26 129dBm B28 129dBm B31 129dBm B66 129dBm BC950N N1_Hardware_Design 44 59 ...

Page 46: ...ecommended to use the U FL R SMT connector provided by Hirose Figure 30 Dimensions of the U FL R SMT Connector Unit mm U FL LP serial connectors listed in the following figure can be used to match the U FL R SMT Figure 31 Mechanicals of U FL LP Connectors The following figure describes the space factor of mated connector BC950N N1_Hardware_Design 45 59 ...

Page 47: ...LPWA Module Series BC950N N1 Hardware Design Figure 32 Space Factor of Mated Connector Unit mm For more details please visit http www hirose com BC950N N1_Hardware_Design 46 59 ...

Page 48: ...lish and maintain functions such as SMS data transmission etc without unrecoverable malfunction effects on radio spectrum or harm to radio network Only one or more parameters like Pout might reduce in their value and exceed the specified tolerances When the temperature returns to normal operation temperature levels the module will meet 3GPP specifications again 3 means under development 5 2 Curren...

Page 49: ...er ESD handling and packaging procedures must be applied throughout the processing handling and operation of any application that incorporates the module The following table shows the module s electrostatic discharge characteristics Table 24 Electrostatic Discharge Characteristics 25ºC 45 Relative Humidity Test Contact Discharge Air Discharge Unit VBAT GND TBD TBD kV Antenna interface TBD TBD kV O...

Page 50: ...ibes the mechanical dimensions of the module All dimensions are measured in millimetre mm and the tolerances for dimensions without tolerance values are 0 05mm 6 1 Mechanical Dimensions of the Module Figure 31 BC950N N1 Top and Side Dimensions Unit mm Pin 1 BC950N N1_Hardware_Design 49 59 ...

Page 51: ...LPWA Module Series BC950N N1 Hardware Design Figure 32 Module Bottom Dimension Unit mm Pin 1 BC950N N1_Hardware_Design 50 59 ...

Page 52: ...ies BC950N N1 Hardware Design 6 2 Recommended Footprint Figure 33 Recommended Footprint Unit mm The module should be kept about 3mm away from other components on the host PCB NOTE Pin 1 BC950N N1_Hardware_Design 51 59 ...

Page 53: ...d Bottom Views of the Module Figure 33 Top View of the Module Figure 34 Bottom View of the Module These are renderings of BC950N N1 module For authentic appearance please refer to the module that you receive from Quectel NOTE BC950N N1_Hardware_Design 52 59 ...

Page 54: ...nt of 30ºC 60 RH Stored at 10 RH 3 Devices require baking before mounting if any circumstance below occurs When the ambient temperature is 23ºC 5ºC and the humidity indication card shows the humidity is 10 before opening the vacuum sealed bag Device mounting cannot be finished within 168 hours at factory conditions of 30ºC 60 4 If baking is required devices may be baked for 8 hours at 120ºC 5ºC As...

Page 55: ... is 238ºC 245ºC and the absolute maximum reflow temperature is 245ºC To avoid damage to the module caused by repeated heating it is strongly recommended that the module should be mounted after reflow soldering for the other side of PCB has been completed The recommended reflow soldering thermal profile lead free reflow soldering and related parameters are shown below Temp C Reflow Zone Soak Zone 2...

Page 56: ...Spray test the laser engraved label information on the shielding can is still clearly identifiable and the QR code is still readable although white rust may be found 7 3 Packaging The modules are stored in a vacuum sealed bag which is ESD protected The bag should not be opened until the devices are ready to be soldered onto the application 7 3 1 Tape and Reel Packaging The reel is 330mm in diamete...

Page 57: ...LPWA Module Series BC950N N1 Hardware Design Figure 35 Tape Dimensions Unit mm Figure 36 Reel Dimensions Unit mm BC950N N1_Hardware_Design 56 59 ...

Page 58: ...ry_SMT_User_Guide Module Secondary SMT User Guide Abbreviation Description ADC Analog to Digital Converter CoAP Constrained Application Protocol DCE Data Communications Equipment typically module DTE Data Terminal Equipment typically computer external controller DTLS Datagram Transport Layer Security EMI Electromagnetic Interference ESD Electrostatic Discharge FTP File Transfer Protocol H FDD Half...

Page 59: ...d Circuit Board PDU Protocol Data Unit PPP Point to Point Protocol PSM Power Save Mode RF Radio Frequency RTC Real Time Clock RXD Receive Data SMS Short Message Service SSL Secure Sockets Layer TCP Transmission Control Protocol TE Terminal Equipment TXD Transmitting Data UART Universal Asynchronous Receiver Transmitter UDP User Datagram Protocol URC Unsolicited Result Code USIM Universal Subscribe...

Page 60: ...aximum Input Low Level Voltage Value VILmin Minimum Input Low Level Voltage Value VImax Absolute Maximum Input Voltage Value VInorm Absolute Normal Input Voltage Value VImin Absolute Minimum Input Voltage Value VOHmax Maximum Output High Level Voltage Value VOHmin Minimum Output High Level Voltage Value VOLmax Maximum Output Low Level Voltage Value VOLmin Minimum Output Low Level Voltage Value BC9...

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