Keypad interface
The phone includes a dual action Camera focus/shot key, Volume up/down keys and Power key. The keys are
located on the Side key flex. Resetting chipset with HW can be done with a long press of Volume down and
Power keys simultaneously. Reset is generated with a dual transistor. These signals are connected to
PMIC8921 GPIOs (1, 2, 6, 8 and 10).
The phone has also standard Back, Home and Search keys on the front. These keys are not physical keys, they
are handled by touch.
Figure 45 Keypad diagram
Accelerometer
Accelerometer is a geometric type component which can be configured either to generate an inertial wake-
up interrupt signal when a programmable acceleration threshold is exceeded along one of the three axes (x,
y, and z), or to detect a free-fall event. Each axis has its own sensor and those can measure positive and
negative directions.
The 3D accelerometer (N1140) sensor is connected to MSM via two GPIOS (10 and 67) and the I2C bus. Power
is provided from VREG _S4_1V8 and VREG_L9_2V85 from the PMIC.
It has the following features:
•
2.16V to 3.6V supply voltage
•
1.8V compatible IOs
•
Low power consumption
•
±2g/±8g dynamically selectable scale
•
I
2
C/SPI digital output interface
•
Embedded self test
•
10000g high shock survivability
•
Pb free/RoHS compliancy
RM-824; RM-825; RM-826
System Module
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Issue 2
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