AD7877 Analog Devices, AD7877 Datasheet - Page 33

• Manufacturer Part Number: AD7877
• Description: Touch Screen Controller
• Manufacturer: Analog Devices

Specifications of AD7877

• Resolution (bits): 12bit
• # Chan: 9
• Sample Rate: 125kSPS
• Interface: Ser
• Analog Input Type: SE-Uni
• Ain Range: Uni (Vref),Uni 2.5V
• Adc Architecture: SAR
• Pkg Type: CSP

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