AD7889 Analog Devices, AD7889 Datasheet - Page 24

• Manufacturer Part Number: AD7889
• Description: Low Voltage Controller for Touch Screens
• Manufacturer: Analog Devices

Specifications of AD7889

• Resolution (bits): 12bit
• # Chan: 6
• Sample Rate: 105kSPS
• Interface: I²C/Ser 2-Wire,Ser,SPI
• Analog Input Type: SE-Uni
• Ain Range: Uni Vdd
• Adc Architecture: SAR
• Pkg Type: CSP

AD7879/AD7889
Table 14. Control Register 3
Address
0x03
1
Table 15. Limit Registers
Address
0x04
0x05
0x06
0x07
If GPIO is enabled in Control Register 2 (Bit 13), AUX and VBAT are both ignored. If AUX and VBAT are both selected and GPIO is disabled, AUX is ignored and VBAT is
measured.
Bit Name
TEMP MASK
AUX/VBAT MASK
INT MODE
GPIO ALERT
AUX/VBAT LOW
AUX/VBAT HIGH
TEMP LOW
TEMP HIGH
X+
Y+
Z1
Z2
AUX
VBAT
TEMP
Not used
Register Name
AUX/VBAT high limit
AUX/VBAT low limit
TEMP high limit
TEMP low limit
Data Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Data Bit
[15:0]
[15:0]
[15:0]
[15:0]
Description
TEMP mask bit.
0 = temperature measurement is allowed to cause interrupt.
1 = temperature measurement is not allowed to cause interrupt.
AUX/VBAT mask bit.
0 = AUX/VBAT measurement is allowed to cause interrupt.
1 = AUX/VBAT measurement is not allowed to cause interrupt.
DAV/INT mode select.
0 = enable DAV mode.
1 = enable INT mode.
Note that this bit overrides any mask bits associated with individual channels.
GPIO interrupt enable.
0 = GPIO can cause an alert on the INT output.
1 = mask GPIO from causing an alert on the INT output.
1 = AUX/VBAT below low limit.
1 = AUX/VBAT above high limit.
1 = TEMP below low limit.
1 = TEMP above high limit.
1 = include measurement of Y position (X+ input).
1 = include measurement of X position (Y+ input).
1 = include Z1 touch-pressure measurement (X+ input).
1 = include measurement of Z2 touch-pressure measurement (Y− input).
1 = include measurement of AUX channel.
1 = include measurement of battery monitor (VBAT).
1 = include temperature measurement.
Unused.
Description
User-programmable AUX/VBAT high limit register
User-programmable AUX/VBAT low limit register
User-programmable TEMP high limit register
User-programmable TEMP low limit register
Rev. C | Page 24 of 40
1
1
Default
Value
0x0000
Default
Value
0x0000
0x0000
0x0000
0x0000