MAX1233_05 Datasheet, PDF (35/45 Pages) Maxim Integrated Products – ±15kV ESD-Protected Touch-Screen Controllers Include DAC and Keypad Controller

±15kV ESD-Protected Touch-Screen
Controllers Include DAC and Keypad Controller
BATTERY VOLTAGE, AUXILIARY INPUT, AND TEMPERATURE INPUT SCAN ([A/D3:A/D0] = 1011)
HOST WRITES
ADC
CONTROL REGISTER
START CLOCK
SET BUSY
LOW
IS ADC
NO
REFERENCE IN
AUTO POWER-DOWN
MODE?
YES
POWER UP REFERENCE
CONVERT
BATTERY INPUT 2
CONVERT
TEMPERATURE INPUT 1
NO
IS DATA
AVERAGING DONE?
YES
STORE BATTERY INPUT 2 IN
BAT2 REGISTER
CONVERT
AUXILIARY INPUT 1
NO
IS DATA
AVERAGING DONE?
YES
STORE TEMPERATURE INPUT 1 IN
TEMP1 REGISTER
CONVERT
TEMPERATURE INPUT 2
POWER UP
ADC
CONVERT
BATTERY INPUT 1
NO
IS DATA
AVERAGING DONE?
YES
STORE BATTERY INPUT 1 IN
BAT1 REGISTER
NO
IS DATA
AVERAGING DONE?
YES
STORE AUXILIARY INPUT 1 IN
AUX1 REGISTER
CONVERT
AUXILIARY INPUT 2
NO
IS DATA
AVERAGING DONE?
YES
STORE AUXILIARY INPUT 2 IN
AUX2 REGISTER
NO
IS DATA
AVERAGING DONE?
YES
STORE TEMPERATURE INPUT 2 IN
TEMP2 REGISTER
POWER DOWN
ADC
POWER DOWN REFERENCE
SET BUSY HIGH
TURN OFF CLOCK
DONE
Figure 20. Scan Mode Flowchart
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