AD7879-1ACPZ-RL Analog Devices Inc, AD7879-1ACPZ-RL Datasheet - Page 23
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AD7879-1ACPZ-RL
Manufacturer Part Number
AD7879-1ACPZ-RL
Description
IC ADC 12BIT CTLR TOUCH 16LFCSP
Manufacturer
Analog Devices Inc
Type
Resistiver
Specifications of AD7879-1ACPZ-RL
Resolution (bits)
12 b
Data Interface
I²C, Serial
Touch Panel Interface
4-Wire
Number Of Inputs/keys
1 TSC
Data Rate/sampling Rate (sps, Bps)
105k
Voltage Reference
External
Voltage - Supply
1.6 V ~ 3.6 V
Current - Supply
10nA
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-LFCSP
Voltage Supply Source
Single Supply
Sampling Rate (per Second)
105k
Sampling Rate
105kSPS
Supply Voltage Range - Analog
1.6V To 3.6V
Supply Current
480µA
Digital Ic Case Style
CSP
No. Of Pins
16
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Table 13. Control Register 2
Address
0x02
1
This delay occurs before conversion of the X and Y coordinate channels (including Z1 and Z2) to allow for screen settling and before the first conversion to allow the
ADC to power up.
Bit Name
PM[1:0]
GPIO EN
GPIO DAT
GPIO DIR
GPIO POL
SER/DFR
AVG[1:0]
MED[1:0]
SW/RST
FCD[3:0]
Data Bit
[15:14]
13
12
11
10
9
[8:7]
[6:5]
4
[3:0]
Description
ADC power management.
00 = full shutdown; the ADC, oscillator, bias, and temperature sensor are all powered down.
01 = analog blocks to be powered down depend on the ADC mode.
If ADC mode is master mode, the ADC, oscillator, bias, and temperature sensor are powered
down and must wake up when the user touches the screen.
If ADC mode is slave mode, the ADC and temperature sensor are powered down when not
being used. They wake up automatically when required. The oscillator and bias are powered
up because they are needed to measure time. This also applies to the single-conversion mode.
10 = ADC, bias, and oscillator are powered up continuously, irrespective of ADC mode.
11 = same as 01.
GPIO enable.
0 = AUX/VBAT channel active.
1 = GPIO enabled on AUX/VBAT/GPIO pin.
GPIO data bit.
GPIO direction.
0 = output.
1 = input.
GPIO polarity.
0 = GPIO pin is active low.
1 = GPIO pin is active high.
Selects normal (single-ended) or ratiometric (differential) conversion.
0 = ratiometric (differential).
1 = normal (single-ended).
ADC averaging.
00 = 2 middle values averaged (one measurement when median filter is disabled).
01 = 4 middle values averaged.
10 = 8 middle values averaged.
11 = 16 values averaged.
Median filter size.
00 = median filter disabled.
01 = 4 measurements.
10 = 8 measurements.
11 = 16 measurements.
Software reset; digital logic is reset when this bit is set.
ADC first conversion delay.
Starts at 128 µs (default) and continues to 4.096 ms in steps of 128 µs (see Table 22).
Rev. C | Page 23 of 40
1
AD7879/AD7889
Default
Value
0x4040