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5: Carrier Board
Snapdragon 845 HDK Hardware Development Kit User Guide 27
Sensor IO Expansion Header J2501
Figure 5-6 J2501 Sensor Expansion Header
The sensor expansion header J2501 allows for a 24-pin connection to an optional sensor board. If user
application does not require a sensor, then this header can be used for other applications that require
I2C or GPIO input and output connections.
Table 5-7 Sensor Expansion Header J2501 Pin out
Description Signal Pin NO Description Signal Pin NO
SSC I2C1
serial data
SSC_I2C1_SD A J2501[1] Accelerometer
interrupt input to
processor via
GPIO117
ACCEL_INT J2501[2]
SSC I2C1
serial clock
SSC_I2C1_SC L J2501[3] Cap interrupt
input to processor
via GPIO123
PRESS_INT_ N J2501[4]
Sensor reset
signal from
processor to
sensor via
GPIO63
MEMS_RESE
T_N
J2501[5] Gyroscope
interrupt input to
processor via
GPIO118
GYRO_INT J2501[6]
Sensor IO
PWR 1.8 V
VREG_LVS2
A
SENS_IO_PW R J2501[7] Sensor Analog
power supply
from VREG_L19A
2.85V or 3.3V
SENS_ANA_P
WR
J2501[8]
GND GND J2501[9] GND GND J2501[10]
HRM
interrupt/
configurable
GPIO73
HRM_INT J2501[11] Touch screen
interrupt input
from processor
via GPIO125
TS_INT_N J2501[12]