User's Manual

SHANGHAI SIMCOM LIMITED
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Figure4-6 SD interface application diagram
4.9 Sensors interface
SIMT1502 support many sensors via I2C bus, the circuit structure is similar to camera interface.
SIMT1502 does not contain necessary pull_up resistors internal, which must be designed in
external circuit.
4.10 Side keys interface
SIMT1502 contains a few keys interfaces, which can be used as functional side keys.
KYPD_SNS0,KYPD_SNS1and KYPD_SNS2 can compose matrix keyboard, also can be used as
normal configurable GPIO.
See Table4-9 for more details.
Table4-9 Side keys interface description
Signal Pin# Description
Direction
DI
/
DO
KYPD_SNS0 40 Keypad sense bit 0 DI
KYPD_SNS1 41 Keypad sense bit 1 DI
KYPD_SNS2 42 Keypad sense bit 2 DI
PM_KYPD_PWR_N 76 Power on key DI
PM_RESIN_N 82 PMIC reset input DI
4.11 Battery connector interface