User Manual

Smart Machine Smart Decision
SIM7100_Hardware_Design_V1.02 2015-06-16
3.13.1 SD2 Interface
The Keypad pins can be multiplexed with SD2 pins. The SD2 is a SDIO 2.0 interface compatible
with WLAN (802.11), its operation voltage is 1.8V.
Table 20: SD2 Pin description
Note: SD2 function is only used in Wi-Fi solution. For more details, please contact SIMCom.
3.14 Other interface
3.14.1 Sink Current Source
The ISINK pin is VBAT tolerant and intended to drive some passive devices, such as LCD
backlight and white LED, etc. Its output current can be up to 40 mA and be set by the AT command
“AT+ CLEDITST”.
Table 21: Sink Current Electronic characteristic
Symbol Description Min. Typ. Max. Unit
V
ISINK
Voltage tolerant 0.5 - VBAT V
I
ISINK
Current tolerant 0 - 40 mA
ISINK is a ground-referenced current sink. The following figure shows its reference circuit.
Pin name Pin No. Function
KBR2 30 SD2_DATA0
KBC1 27 SD2_DATA1
KBC0 28 SD2_DATA2
KBC2 31 SD2_DATA3
KBR0 29 SD2_CMD
KBC3 32 SD2_CLK