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AD7877 Datasheet(PDF) 33 Page - Analog Devices

Part # AD7877
Description  Touch Screen Controller
PDF  44 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7877 Datasheet(HTML) 33 Page - Analog Devices

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AD7877
Rev. A | Page 33 of 44
REGISTER MAPS
Table 13. Write Register Map
Register Address
Binary
WADD3
WADD2
WADD1
WADD0
HEX
Register Name
Description
0
0
0
0
0
None
Unused. Writing to this address has no effect.
0
0
0
1
1
Control Register 1
Contains ADC channel address, register read address, and ADC
mode.
0
0
1
0
2
Control Register 2
Contains ADC averaging, acquisition time, power manage-
ment, first conversion delay, STOPACQ polarity, and reference
and timer settings.
0
0
1
1
3
Alert
Status/Enable
Register
Contains status of high/low limit comparisons for TEMP1, BAT1,
BAT2, and AUX1, and enable bits to allow these channels to
become interrupt sources.
0
1
0
0
4
AUX1 High Limit
User-programmable AUX1 upper limit.
0
1
0
1
5
AUX1 Low Limit
User-programmable AUX1 lower limit.
0
1
1
0
6
BAT1 High Limit
User-programmable BAT1 upper limit.
0
1
1
1
7
BAT1 Low Limit
User-programmable BAT1 lower limit.
1
0
0
0
8
BAT2 High Limit
User-programmable BAT2 upper limit.
1
0
0
1
9
BAT2 Low Limit
User-programmable BAT2 lower limit.
1
0
1
0
A
TEMP1 Low Limit
User-programmable TEMP1 lower limit.
1
0
1
1
B
TEMP1 High Limit
User-programmable TEMP1 upper limit.
1
1
0
0
C
Sequencer
Register 0
Contains channel selection data for slave mode (software)
sequencing.
1
1
0
1
D
Sequencer
Register 1
Contains channel selection data for master mode (hardware)
sequencing.
1
1
1
0
E
DAC Register
Contains DAC data and setup information.
1
1
1
1
F
Extended Write
Not a physical register. Enables writing to extended writing
map.
Table 14. Extended Writing Map
Register Address
Binary
EADD3
EADD2
EADD1
EADD0
HEX
Register Name
Description
0
0
0
0
0
GPIO Control
Register 1
Contains polarity, direction, enabling, and interrupt enabling
settings for GPIO1 and GPIO2.
0
0
0
1
1
GPIO Control
Register 2
Contains polarity, direction, enabling, and interrupt enabling
settings for GPIO3 and GPIO4.
0
0
1
0
2
GPIO Data
Contains GPIO1 to GPIO4 data.



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