User's Manual

SHANGHAI SIMCOM LIMITED
27
SIMT1502 must be provided voltage by external voltage source.
See Table4-10 for more details.
Table4-10 Battery connector description
Signal Pin# Description
Direction
AI
/
AO
BAT_THERM 90 Battery therm monitor AI
VBATT 88/92/124(No External Charging IC) Battery positive supply AI
VBATT 88 (With External Charging IC) Battery positive supply AI
GND
2/32/43/46/62/73/80/91/95/
114/123/125/126/127/128
Ground -
4.12 I2C , UART and SPI interface
4.12.1 UART
SIMT1502 contains two groups UART_DM .The UART_DM is used to support high-speed
UART operation up to 4 Mbps for debug and system log. UART only supports Slow_IrDA.
See Table4-11 and Figure4-7 for more details:
Table4-11 UART interface description
Signal Pin# Description
Direction
I
/
O
GPIO_4 26 UART1 TX O
GPIO_5 27 UART1 RX I
GPIO_6 24 UART1 CTS_N I
GPIO_7 25 UART1 RTS_N O
GPIO_20 38 UART2 TX O
GPIO_21 39 UART2 RX I
GPIO_111 28 UART2 CTS_N I
GPIO_112 29 UART2 RTS_N O
Figure4-7 UART application diagram