ad7879-1acbz-rl Analog Devices, Inc., ad7879-1acbz-rl Datasheet - Page 27

• Manufacturer Part Number: ad7879-1acbz-rl
• Description: Low Voltage Controller For Touch Screens
• Manufacturer: Analog Devices, Inc.

CONTROL REGISTER 3
Control Register 3 (Address 0x03) includes the interrupt
register (Bits[15:8]) and Control Register 3 (Bits[7:0]).
Sequencer
The sequencer bits control which channels are converted during
a conversion sequence in both slave and master mode.
To include a measurement in a sequence, the relevant bit must
be set in the sequence. Setting Bit 7 includes a measurement on
the X+ channel (Y position). Setting Bit 6 includes a measure-
ment on the Y+ channel (X position), and so on.
Figure 32 illustrates the correspondence between the bits in
Control Register 3 and the various measurements. Bit 0
is not used.
15
MASK
TEMP
MASK
VBAT
AUX/
MODE
INT
ALERT
GPIO
VBAT
AUX/
LOW
VBAT
HIGH
AUX/
Figure 31. Control Register 3
TEMP
LOW
Rev. 0 | Page 27 of 36
TEMP
HIGH
X+
Y+
CONVERSION
SINGLE
Z1
01
Z2
AUX
Figure 32. Conversion Modes
WAIT FOR TIMER
CONVERSION
SLAVE MODE
START TIMER
ADC MODE?
TIMER = 00?
VBAT TEMP
SEQUENCE
IDLE
10
NO
00
USED
NOT
0
WAIT FOR TIMER
MASTER MODE
FIRST TOUCH
CONVERSION
START TIMER
TIMER = 00?
SEQUENCE
TOUCHED?
TOUCHED?
WAIT FOR
SCREEN
SCREEN
YES
NO
YES
11
AD7879
YES
NO
NO