SimCom SIM8905A Скачать руководство пользователя страница 13 | Manualshive

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SimCom SIM8905A Скачать руководство пользователя страница 13

Smart Machine Smart Decision

13

Module

Connector

USB_DM

GND

GND

USB_VBUS

VBUS

<1pF

USB_DP

USB_DM

USB_ID

USB_ID

USB_DP

External 5V

Figure14: USB_OTG reference circuit

Linear Battery Charger

SIM8905A module integrates a 1.44A linear battery charger for single-cell lithium-ion batteries.

Charging Control

Battery charging is controlled by a PMIC state-machine. The first step in the automated charging process
determines if trickle charging is needed. Charging of a severely depleted battery must begin with trickle charging
to limit the current, avoid pulling VDD down, and protect the battery from more charging current than it can
handle. Once a minimum battery voltage is established using trickle charging, constant-current charging is enabled
to charge the battery quickly – this mode is sometimes called fast charging. Once the battery approaches its target
voltage, the charge is completed using constant-voltage charging.

V

WEAK

V

TRKL

3.2V

2.8V

V

BAT

V

BAT-MAX

4.2V

450mA/1440mA

I

BAT

I

BAT-MAX

Time

TRKL-A TRKL-B CC

CV

I

TRKL-A

90mA

I

TRKL-B

450

mA

Figure15: Charging control diagram

Table 3: Linear battery charger performance specifications

Parameter

Comments

Min

Typ

Max

Units

«
...
11
12
13
14
15
...
»

Содержание SIM8905A

Страница 1: ...SIM8905A_User Manual_ V1 00...

Страница 2: ...ructions and transmitter operating conditions for satisfying RF exposure compliance 2 Any changes or modifications not expressly approved by the grantee of this device could void the user s authority...

Страница 3: ...lash devices up to 32GB Operating System Android OS 5 1 7 1 8 Power supply 3 4V 4 4V Charge management Integrated 1 44 A linear charger for single cell lithium ion batteries Display 4 lane MIPI_DSI 1...

Страница 4: ...HR Audio codec support MP3 AAC eAAC AMR NB WB G 711 WMA 9 10 Pro USIM card Dual cards dual standby Transmission rate LTE Category 4 150 Mbps DL LTE Category 4 50 Mbps UL Temperature range Operating t...

Страница 5: ...DET HPH_L USB_VBUS GND GND VBAT_THERM VBAT_SNS GND ANT_DRX GND LDO17_2V85 ADC CHARGE_SEL VRTC ANT_GNSS GND GPIO_8 GND LDO6_1V8 GPIO_17 GPIO_16 GPIO_95 SD_DATA1 SD_DATA2 SD_DATA3 SD_CLK SD_CMD SD_DATA0...

Страница 6: ...Smart Machine Smart Decision 6 1 4 Picture Figure 1 Top and Bottom view of SIM8905A...

Страница 7: ...Smart Machine Smart Decision 7 1 5 Dimension Figure 2 Dimention...

Страница 8: ...3 Block diagram of SIM8905A 3 Interface Application Power Supply The power supply pins of SIM8905A include VBAT_RF and VBAT_BB VBAT_RF directly supplies the power to RF PA VBAT_BB supplies the power...

Страница 9: ...their maximum voltage may rise over the absolute maximum voltage of the module When battery is used the total impedance between battery and VBAT pins should be less than 150m In any case mentioned abo...

Страница 10: ...already pulled up to 1 8V internally so external pull up is not necessary Reference circuits are shown as below 4 7K 47K PWRKEY R 1 8V 1K PMU Module Figure 7 Powered on down module using transistor P...

Страница 11: ...n When VBAT is present and valid coin cell charging is enabled through software control and powered from VBAT Reference circuits are shown as below Keep alive capacitor RTC Module VRTC Capacitor Figur...

Страница 12: ...D_LDO12 32 1 8 2 95 50 For SD signals pull up USIM1_VDD 26 1 8 2 95 50 USIM 1 USIM2_VDD 21 1 8 2 95 50 USIM 2 LDO17_2V85 129 2 85 420 Display camera sensors USB Interface SIM8905A provides one High sp...

Страница 13: ...ry must begin with trickle charging to limit the current avoid pulling VDD down and protect the battery from more charging current than it can handle Once a minimum battery voltage is established usin...

Страница 14: ...assignments Pin Name Pin Expected or Default Function Alternative Function 1 Alternative Function 2 UART2_TXD 94 BLSP1_UART_TX BLSP1_SPI_MOSI UART2_RXD 93 BLSP1_UART_RX BLSP1_SPI_MISO SENSOR_I2C_SDA 9...

Страница 15: ...SD_DET LDO5_1V8 Module 1uF 33pF TVS C 15pF Placed close to SD card 33R 33R is required for high speed operation placed close to the module NM NM NM NM NM 1uF SD_LDO12 NM Not Mounting Reserved Figure17...

Страница 16: ...CLK_M MIPI_DSI_CLK_P MIPI_DSI_LANE0_M MIPI_DSI_LANE0_P LDO17_2V85 1uF 1uF LDO6_1V8 PWM WLED driver VBAT Module 1M Figure 18 Display reference circuit Touch Screen Interface Table 6 Touch screen interf...

Страница 17: ..._P 64 I MIPI_CSI0_LN0_M 65 I MIPI_CSI0_LN0_P 66 I MIPI_CSI0_LN1_M 67 I MIPI_CSI0_LN1_P 68 I MIPI_CSI1_CLK_M 70 I Secondary camera serial interface MIPI_CSI1_CLK_P 71 I MIPI_CSI1_LN0_M 72 I MIPI_CSI1_L...

Страница 18: ...outputs including earpiece stereo headphones and mono class D speaker driver Table 8 Audio interface pin definitions Pin Name Pin Type Description EAR_P 8 O Earpiece output positive EAR_M 9 O Earpiec...

Страница 19: ...d capless 19 3 25 1 Vrms Signal to noise ratio Single ended A weighted capless 92 0 94 0 dB THD N ratio Analog input 1 dBV f 1 02 kHz single ended input 200 Hz to 20 kHz bandwidth capless 86 0 70 0 dB...

Страница 20: ...r normally closed NC type headset jack HPH_R Module HPH_L 0R 0R HS_DET MIC2P GND_MIC HPH_GND 100K 33pF 33pF 33pF Headset Jack TVS Close to headset jack 1000 OHM 100MHZ 1000 OHM 100MHZ 1000 OHM 100MHZ...

Страница 21: ...1 Earpiece output performance specifications Parameter Test conditions Min Typ Max Units Output power 32 load f 1 02 kHz 6 dB gain THD N 1 120 0 124 5 mW 16 load f 1 02 kHz 6 dB gain THD N 1 235 0 243...

Страница 22: ...4 2 V 85 0 75 0 dB 800 mW Pout VDD_SPKR 4 2 V 75 0 45 0 dB 600 mW Pout VDD_SPKR 3 8 V 75 0 70 0 dB 500 mW Pout VDD_SPKR 3 6 V 76 0 71 0 dB Efficiency Vdd 3 7 V 500 mW Pout 15 H 8 15 H 82 0 84 0 1 W Po...

Страница 23: ...External bypass mode 1 0 1 0 1 0 5 F USIM Interface SIM8905A supports dual cards dual standby and card presence detection Note The standard software provided by SIMCom only supports single USIM1 card...

Страница 24: ...able 15 ADC performance parameters Parameter Comments Min Typ Max Unit Input voltage range Programmable 0 1 0 3 1 7 4 5 V Resolution 16 bits Analog input bandwidth 100 kHz Sample rate XO 8 2 4 MHz INL...

Страница 25: ...her noisy traces Keep the RF traces as short as possible MAIN Antenna reference circuit The recommended circuit is shown as below RF connector optional C1 Module 87 ANT_MAIN GND C2 88 R1 Matching circ...

Страница 26: ...7 DRX antenna recommended circuit R1 C1 and C2 are antenna matching components in Figure 28 the value of these components are determined according to the antenna tuning results By default R1 is 0 C1 a...

Страница 27: ...e module s antenna pin Antenna matching circuit should be placed close to the antenna Keep the RF traces at 50 Maintain a complete and continuous reference ground plane from antenna pin to the RF conn...

Страница 28: ...e next to a ground plane Minimize the number of via on the trace Refer to the following table for the length of MIPI traces inside the module Table 16 Length of MIPI traces inside the module Pin Net N...

Страница 29: ...rruption Protect SDC signals from noisy signals clocks SMPS etc Up to 200 MHz clock rate 50 nominal 10 trace impedance CLK to DATA CMD length matching 1 mm 30 35 termination resistor on clock lines ne...

Страница 30: ...als with fast transients EAR output signal route as differential pair with 10 mil trace widths SPK output signals route as differential pair with 20 mil trace widths with 8 load and 25 mil trace width...

Страница 31: ...ility are only guaranteed within the operating conditions Table 19 Absolute maximum ratings Parameter Min Max Unit VBAT 0 3 5 V VBUS 0 3 7 V VRTC 3 5 V Temperature Range Table 20 Temperature range Par...

Страница 32: ...voltage 0 3 0 2 USIM_VDD V VOH High level output voltage 0 8 USIM_VDD USIM_VDD V VOL Low level output voltage 0 0 4 V Table 24 SD interface characteristics SD_LDO11 1 8V Parameter Description Min Typ...

Страница 33: ...sumption 5 10 uA VRTC OUT VRTC output voltage 2 5 3 1 3 2 V IRTC OUT VRTC output current 2 mA Current Consumption VBAT 3 9V Table 28 Current consumption Parameter Conditions Min Typ Max Unit Leakage c...

Страница 34: ...ct discharge Air discharge VBAT 5KV 10 KV GND 5KV 12KV Antenna 5KV 10KV PWRKEY 4KV 6KV Module Operating Frequencies Table 30 Module operating frequencies Frequency Receive Transmit Physical channel LT...

Страница 35: ...g Sensitivity Table 32 Reference sensitivity QPSk PREFSENS LTE E UTRA Band number 1 4 MHz 3 MHz 5 MHz 10 MHz 15 MHz 20 MHz Duplex mode 2 102 7 99 7 98 95 93 2 92 FDD 4 104 7 101 7 100 97 95 2 94 FDD 5...

Страница 36: ...Decision 36 Contact us Shanghai SIMCom Wireless Solutions Co Ltd Address Building B SIM Technology Building No 633 Jinzhong Road Shanghai P R China 200335 Tel 86 21 3157 5100 Fax 86 21 3157 5200 URL...

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