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Dialog Semiconductor DA14681, Hardware Manual

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Dialog Semiconductor DA14681 Hardware Manual Download Page 16

 

 

UM-B-077 

 

DA14681 Wearable Development Kit Hardware Manual 

  

User Manual 

Revision 1.2 

06-Apr-2017 

CFR0012 

16 of 47 

© 2017 Dialog Semiconductor 

4.2 

GPIO Expander 

Due to the high GPIO demand in this reference design a GPIO expander was necessary. The 
component used is the low power I2C controlled 

FXL6408UMX

 from Fairchild. It uses both power 

rails of 1.8 V and 3.3 V while its power consumption remains very low at only 1.5 

A (Sleep current). 

Table 5: GPIO Expander Pin Assignment 

GPIO Expander 

Pin Name 

Section 

P0 

Test point 

 

P1 

Test point 

 

P2 

MIC_EN 

Microphone  

P3 

TFT_EN 

LCD  

P4 

HRM_EN 

Heart Rate Monitor 

P5 

NFC_EN(3V Ldo) 

NFC 

P6 

ENVDDSE 

NFC 

P7 

7816RST 

NFC 

Driving signals (I2C) are supplied from the 1.8 V rail whereas the output signals are driven from the 
3.3 V voltage rail. 

 

Figure 9: GPIO Expander Schematic 

 

 

Summary of Contents for DA14681

Page 1: ...odule includes a geomagnetic sensor an accelerometer a combined environmental sensor that can sense temperature pressure and humidity levels a heart rate monitor and NFC functionality It can display environmental readings as well as health data such as step count distance traveled calories burned and heart rate All these functions are combined in a wearable like watch enabling the user to physical...

Page 2: ...Sensor 24 4 6 4 BH1750FVI Ambient Light Sensor 24 4 7 RTC Real Time Clock 25 4 8 Antenna 26 4 9 Heart Rate Monitor HRM 27 4 10 DA14681 Wearable Reference Design Motherboard Schematics 29 5 DA14681 Reference Design Daughterboard 32 5 1 Near Field Communication NFC 32 5 2 Capacitive Touch and Proximity Controller 36 6 Wearable Reference Design PCB 39 7 Power Consumption Measurements 41 8 Wearable Re...

Page 3: ...Controller Schematic 36 Figure 33 Shield Layer Function 36 Figure 34 PCB Touch Pad Recommended Shapes 37 Figure 35 PCB Touch Pad Daughterboard Top View 37 Figure 36 PCB Touch Pad Daughterboard Bottom View 37 Figure 37 Touch Pad Daughterboard Attached to the Motherboard 37 Figure 38 DA14681 Wearable Reference Design Daughterboard Schematic 38 Figure 39 DA14681 Wearable Reference Design Motherboard ...

Page 4: ...2 06 Apr 2017 CFR0012 4 of 47 2017 Dialog Semiconductor Table 14 Electrical Characteristics IR LED 27 Table 15 Electrical Characteristics Green LED 28 Table 16 NFC Module Pin Description Partial 33 Table 17 Current Consumption of Wearable Reference Design Sensors and Peripherals 41 ...

Page 5: ...ally Controlled Crystal Oscillator HRM Heart Rate Monitor HW hardware IF Infrared IFA Inverted F Antenna IoT Internet of Things JTAG Join Test Action Group test interface LED Light Emitting Diode LDO Low Drop Out regulator NFC Near Field Communication PCBA Printed Circuit Board Assembled RF Radio Frequency RTC Real Time Clock SE Secure Element SMD Surface Mounted Device SOC System on Chip SPI Seri...

Page 6: ... output power conducted VBAT 3 V TA 25 C 0 dBm 3 Introduction Wearable devices are miniature electronic devices worn on the body often integrated with or designed to replace an existed accessory such as a watch This market segment is currently booming and is enabled by Internet of Things IoT technology Thus the need for smaller low power devices is rapidly increasing Some of the current trends are...

Page 7: ...ebugging connector NFC Ifineon Capacitive touch 2xIR LED GPIO Push Button HRM Discrete solution LDR2 2x GRN LED I2C_Bosch USB Connector I2C BME_nCS BMI_nCS UART2 I2C QSPI I2C USBP USBN VBUS I2C Serial Interface GPIO V18P V33 V33 V18P V18 VBAT V18P V18P V18P V33 V18P V18P LiPoly 190mAh V18 VBAT 3V LDO V33 1 28 TFT monochrome DISPLAY 32KHz RTC Daughterboard 3V_LDO I2C V18P clk VBAT V33 VBAT Vibrator...

Page 8: ...elopment Kit Hardware Manual User Manual Revision 1 2 06 Apr 2017 CFR0012 8 of 47 2017 Dialog Semiconductor Figure 2 680 RD wearable mb_vE Top view Figure 3 680 RD wearable mb_vE Bottom view Push Button Vibrator Debugging port HRM ...

Page 9: ...sh memory for DA14681 The advanced power management unit of the DA14681 enables it to run from primary and secondary batteries as well as provide power to external devices An on chip PLL enables on the fly tuning of the system clock between 32 kHz and 96 MHz to meet the high processing requirements Figure 4 DA14681 System Schematic The DA14681 SoC power management subsystem consists of VBUS Batter...

Page 10: ...at supplies the digital core of the DA14681 and delivers up to 50 mA at 1 2 V when in active mode A 4 7 F decoupling capacitor C6 is used 0402 package 6 3 V V14 Power rail that delivers up to 20 mA at 1 4 V and should not be used for supplying external devices A 4 7 F decoupling capacitor C7 is placed close to the V14 pin 0402 package 6 3 V V14_RF Supply voltage input It is shorted to V14 on the P...

Page 11: ...enforced in order to be able to program debug the wearable reference design board Interface board settings see Figure 5 ON OFF switch set to ON USB cable connected at the mini USB connector IDC 10 cable from the 1 27 mm pitch header to the target board Wearable reference design board settings see Figure 2 and Figure 3 IDC 10 cable from interface board is connected at the bottom of the wearable ref...

Page 12: ...14681 Wearable Development Kit Hardware Manual User Manual Revision 1 2 06 Apr 2017 CFR0012 12 of 47 2017 Dialog Semiconductor Figure 7 IDC 10 Cable between Interface Board and Wearable Reference Design Enclosure ...

Page 13: ...pin Figure 8 QSPI Data Flash Schematic The DA14681 uses the external Flash memory for directly executing code with some help from the internal cache or simply for mirroring the contents in RAM during booting option selectable via the binary image header 4 1 3 Crystal Oscillators The DA14681 SoC has two Digitally Controlled Crystal Oscillators DCXO one at 16 MHz XTAL16M and a second at 32 768 kHz X...

Page 14: ...gnment Table 4 shows the pin assignment and related pin names on the aQFN60 package of the DA14681 Table 4 680 RD wearable mb_vE Pin Assignment DA14681 AQFN60 Pin Name Reference Design Signal Section P0_0 QSPI_CLK QSPI data flash P0_1 QSPI_D0 QSPI data flash P0_2 QSPI_D1 QSPI data flash P0_3 QSPI_D2 QSPI data flash P0_4 QSPI_D3 QSPI data flash P0_5 QSPI_CS QSPI data flash P0_6 SWDIO Debugging JTAG...

Page 15: ...2 SPI_SCK Sensors P3_3 BMI_nCS Sensors P3_4 BME_nCS Sensors P3_5 7816CLK NFC P3_6 BMI_INT Sensors P3_7 VDDSE NFC P4_0 7816IO URX side NFC P4_1 VIB_EN Vibrator P4_2 RTC_IRQ RTC P4_3 7816IO UTX side NFC P4_4 HRM_INT Heart Rate Monitor P4_5 PDM_CLK Microphone P4_6 SDA Sensors HRM RTC Touch P4_7 SCL Sensors HRM RTC Touch LED1 LED1 Optional enable to vibrator motor LED2 LED2 Heart Rate Monitor LED3 LED...

Page 16: ...UMX from Fairchild It uses both power rails of 1 8 V and 3 3 V while its power consumption remains very low at only 1 5 A Sleep current Table 5 GPIO Expander Pin Assignment GPIO Expander Pin Name Section P0 Test point P1 Test point P2 MIC_EN Microphone P3 TFT_EN LCD P4 HRM_EN Heart Rate Monitor P5 NFC_EN 3V Ldo NFC P6 ENVDDSE NFC P7 7816RST NFC Driving signals I2C are supplied from the 1 8 V rail ...

Page 17: ...icon digital microphone with a single bit PDM output In this reference design the microphone s data signal is driven by the GPIO P0_7 from the DA14681 SoC Its power consumption during sleep is only 4 6 A The microphone is supplied from an output pin GPIO2 of the GPIO expander In this way the user can turn off the microphone completely when it is not used Default state for the microphone is OFF Fig...

Page 18: ...from HHS which is available with capacities of 190 mAh and 250 mAh Table 6 shows the battery dimensions Table 6 Battery Dimensions Capacity mAh Dimensions mm Thickness mm 190 30 x 30 3 2 250 30 x 30 3 7 The actual Li Po battery rechargeable battery can be seen in Figure 11 Figure 11 3 7 V 190 mAh Li Po Battery The charging and discharging curves of the 190 mAh battery are illustrated in Figure 12 ...

Page 19: ...cteristics of the 190 mAh Li Po Battery The LiPo battery discussed is equipped with a protection circuit module PCM The PCM will generally provide the battery with overcharge discharge protection short circuit protection current limitation and voltage and current balancing in each cell All of these factors are important in obtaining the maximum output and longest operating life from a rechargeable...

Page 20: ...s there are no continuous data transfers to refresh the image the image needs to be written just once Figure 14 TFT Display External Clock Selection The alternating signal needed to prevent any DC bias from building up inside the display is supplied by an external clock signal generated by a Real Time Clock module see section 4 7 Figure 15 illustrates the TFT display connectivity necessary to impl...

Page 21: ...el for data memory Super low power consumption TFT panel Module outline dimensions mm 26 6 W x 30 3 H x 0 741 T Table 7 Recommended Operating Conditions Parameter Description Min Typ Max Unit VDDA Analog supply voltage 2 7 3 0 3 3 V VDD Logic supply voltage 2 7 3 0 3 3 V VIH High level input voltage VDD 0 1 VDD V VIL Low level input voltage VSS VSS 1 V Table 8 Power Consumption Mode Min Typ Max Un...

Page 22: ...pically 950 A while this is dropped down to 3 A is suspend mode The BMI160 module is connected to the DA14681 via an SPI interface In this reference design the secondary I2C interface of the BMI160 is used to connect the BMM150 magnetometer to the BMI160 in slave mode in order to acquire the data in synchronized form This configuration is called cascade mode and minimizes the number of the GPIOs n...

Page 23: ...hes the demanding requirements of all 3 axis mobile applications such as electronic compass navigation or augmented reality applications The magnetometer is not connected directly to the DA14681 but only via the BMI160 and through the I2C interface The current consumption is 500 A in normal mode while in sleep mode it is 3 A Figure 18 BMM150 Geomagnetic Sensor Schematic Table 10 BMM150 Geomagnetic...

Page 24: ...n of the pressure and humidity sensors and can also be used for estimating ambient temperature The BME280 is connected to the DA14681 BLE using an SPI interface The current consumption in normal mode is 3 6 A while in sleep mode it is 0 1 A Figure 19 BME280 Environmental Sensor Schematic Table 11 BME280 Environmental Sensor Electrical Characteristics Parameter Min Typ Max Unit Supply Voltage VDD 1...

Page 25: ...X5 from Abracon which includes on chip oscillators to provide minimum power consumption full RTC functions including battery backup and programmable counters and alarms for timer and watchdog functions and an I2C interface for communication with the DA14681 The RTC schematic is shown in Figure 21 The power consumption during sleep mode is 0 34 A When initialized it charges a 80 mF super capacitor ...

Page 26: ...rently used in the wearable reference design This selection has been made for the following advantages SMD miniature type of manufacturability Remains reliable and versatile Easy tuning Figure 22 Ceramic Antenna PCB Footprint and Mechanical Specifications Table 12 Key Antenna Characteristics Part Number Frequency MHz Peak Gain dBi Average Gain dBi Return Loss dB 2450AT18A100 2400 to 2500 0 5 XZ V ...

Page 27: ...odule uses a set of combined IR Green LEDs IRG1615D01 940 nm 530 nm Green Infrared LED from Dyna Image that comes in single package The key characteristics of the LEDs can be found in Table 13 Table 14 and Table 15 Other green LEDs such as QBLP676 IG from QT Brightek can be used to replace the IRG1615D01 LED module The only requirement is that they must have the same wavelength and the cross point...

Page 28: ...ectrical Characteristics Green LED Parameter Symbol Color Min Typ Max Unit Forward Voltage VF Green 3 2 3 4 V Luminous Intensity IV Green 715 1070 mcd Reverse Current IR Green 1 μA Peak Wavelength λP Green 530 nm Dominant Wavelength λD Green 530 540 nm Spectral Line Half width Δλ Green 35 nm Viewing Angle 2θ1 2 Green 120 deg Figure 23 HRM Schematic ...

Page 29: ...ment Kit Hardware Manual User Manual Revision 1 2 06 Apr 2017 CFR0012 29 of 47 2017 Dialog Semiconductor 4 10 DA14681 Wearable Reference Design Motherboard Schematics Figure 24 680 RD wearable mb_vE BLE SoC QSPI GPIO Expander Schematic ...

Page 30: ...UM B 077 DA14681 Wearable Development Kit Hardware Manual User Manual Revision 1 2 06 Apr 2017 CFR0012 30 of 47 2017 Dialog Semiconductor Figure 25 680 RD wearable mb_vE Peripherals Schematic ...

Page 31: ...UM B 077 DA14681 Wearable Development Kit Hardware Manual User Manual Revision 1 2 06 Apr 2017 CFR0012 31 of 47 2017 Dialog Semiconductor Figure 26 680 RD wearable mb_vE Sensors Schematic ...

Page 32: ... in this reference design is the LA66002 from Infineon and is suitable to implement the following modes Read Write Mode The NFC module reads data from an NFC smart object and acts accordingly NFC smart poster applications can be supported via the ISO 14443 scheme Card Emulation Mode The NFC module emulates a contactless card to enable operations such as contact less payments ticketing etc In the N...

Page 33: ... and front end Due to its high power consumption during operation the LA66002 NFC module is powered separately by a 3 3 V LDO AP2127K 3 3TRG1 from Diodes Inc Table 16 NFC Module Pin Description Partial Pin Number Pin Name Description 5 ENVDDSE Digital input that controls VDD of the secure element 6 7816CLK Clock when in ISO 7816 usage 10 7816RST ISO 7816 enable disable pin when high host communica...

Page 34: ...DA14681 Upon powering up and entering host mode successfully the NFC module will output an Answer to Reset ATR message after which protocol parameter negotiation and communication with the host can be initiated Figure 30 Voltage Levels of the NFC Module Pins Host Communication Mode In order to power up the NFC module in RF Communication card emulation mode only power needs to be applied while the ...

Page 35: ...Pins RF Communication Mode The NFC module runs its own dedicated secure operating system and applications and communicates with the host or reader via standard and application specific APDU Application Protocol Data Unit commands The devices come pre programmed with a sample application from the manufacturer Other applications can also be loaded depending on the required function ...

Page 36: ...ser to navigate through the various sensor readings that appear on the TFT display The touch sensor is accessible by the DA14681 via the I2C interface The PCB touch pads are shown in Figure 35 they are oval shaped with a 10 mm pitch to ensure proper sensitivity For optimum noise performance there is a dedicated shield pin CS0A CS1A This shield as shown in Figure 33 can be a simple copper area on a...

Page 37: ... of 47 2017 Dialog Semiconductor Figure 34 PCB Touch Pad Recommended Shapes Figure 35 680_RD_WEARABLE_PCB_TOUCH_BUTTONS_2X_VC Top View Figure 36 680_RD_WEARABLE_PCB_TOUCH_BUTTONS_2X_VC Bottom View Figure 37 Touch Pad Daughterboard Attached to the Motherboard Capacitive Controller SX9300 NFC Module LA66002 ...

Page 38: ...077 DA14681 Wearable Development Kit Hardware Manual User Manual Revision 1 2 06 Apr 2017 CFR0012 38 of 47 2017 Dialog Semiconductor Figure 38 680_RD_WEARABLE_PCB_TOUCH_BUTTONS_2X_VC Daughterboard Schematic ...

Page 39: ...Kit Hardware Manual User Manual Revision 1 2 06 Apr 2017 CFR0012 39 of 47 2017 Dialog Semiconductor 6 Wearable Reference Design PCB Figure 39 680 RD wearable mb_vE Motherboard Top View Figure 40 680 RD wearable mb_vE Motherboard Bottom View ...

Page 40: ...Hardware Manual User Manual Revision 1 2 06 Apr 2017 CFR0012 40 of 47 2017 Dialog Semiconductor Figure 41 680_RD_WEARABLE_PCB_TOUCH_BUTTONS_2X_VC Daughterboard Top View Figure 42 680_RD_WEARABLE_PCB_TOUCH_BUTTONS_2X_VC Daughterboard Bottom View ...

Page 41: ... been taken for each sensor and peripheral of the system Figure 43 Current Measurement Test Points Table 17 Current Consumption of Wearable Reference Design Sensors and Peripherals System Component Current consumption A DA14681 BLE SoC 3 41 QSPI Flash memory 0 38 LDO 0 06 TFT LCD display 0 05 HRM module DI5115 2 27 Environmental sensor BME280 0 12 Microphone 4 6 RTC 0 34 Accelerometer Gyro BMI160 ...

Page 42: ...CFR0012 42 of 47 2017 Dialog Semiconductor Figure 44 Actual Current Consumption Waveform Sleep Mode from DC Power Analyzer The average current consumption in Advertising mode is approximately 250 A When the wearable device is connected to a host this goes up to 550 A advertising pulse period 1 s ...

Page 43: ... this wearable reference design was to fit inside a wrist watch type housing so it can be used as fitness equipment This section presents the enclosure that was developed for the wearable reference design Figure 45 Wearable Reference Design Wnclosure Exploded View Figure 46 Wearable Reference Design Enclosure Side View Back and HRM Cover PCB TFT display and battery case Upper cover Glass cover ...

Page 44: ...077 DA14681 Wearable Development Kit Hardware Manual User Manual Revision 1 2 06 Apr 2017 CFR0012 44 of 47 2017 Dialog Semiconductor Figure 47 Actual Enclosure Top View Figure 48 Actual Enclosure Bottom View ...

Page 45: ...UM B 077 DA14681 Wearable Development Kit Hardware Manual User Manual Revision 1 2 06 Apr 2017 CFR0012 45 of 47 2017 Dialog Semiconductor Figure 49 Wearable Watch Placed on the Left Wrist ...

Page 46: ...anual User Manual Revision 1 2 06 Apr 2017 CFR0012 46 of 47 2017 Dialog Semiconductor Revision History Revision Date Description 1 0 17 Nov 2016 Initial version 1 1 08 Feb 2017 Text revision 1 2 06 Apr 2017 Text revision with regards to naming convention ...

Page 47: ...the sole responsibility of the customer and Dialog Semiconductor excludes all liability in this respect Customer notes that nothing in this document may be construed as a license for customer to use the Dialog Semiconductor products software and applications referred to in this document Such license must be separately sought by customer with Dialog Semiconductor All use of Dialog Semiconductor pro...

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