User Interface; Touch Module - Nokia 500 Service Manual

RM-750
System Module
Figure 25 Charger interface

User interface

Touch module

This phone uses Synaptic capacitive touch series 3000.
The Synaptics MT touch module is interfaced to I2C bus of RAPU. RAPU's GenIO123 is used for Touch INT.
The Synaptics MT touch module operates with VAUX1 supply output from EM ASIC.
Whenever the user touches the touch screen, the controller raises an interrupt to RAPU which initiates I2C
transactions to identify the locations the user touches on the display.
Figure 26 Touch system block diagram
Issue 1 COMPANY CONFIDENTIAL Page 6 – 19
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