參數(shù)資料
型號(hào)： AD7877ACPZ-500RL7
廠商： ANALOG DEVICES INC
元件分類： 消費(fèi)家電
英文描述： Touch Screen Controller
中文描述： SPECIALTY CONSUMER CIRCUIT, QCC32
封裝： 5 X 5 MM, ROHS COMPLIANT, MO-220VHHD-2, LFCSP-32
文件頁(yè)數(shù)： 36/44頁(yè)
文件大小： 1002K
代理商： AD7877ACPZ-500RL7
AD7877
Register Name: Control Register 2
Write Address: 0010; Read Address: 00010; Default Value: 0x000.
Table 17.
Read/
Write
Description
0
TMR0
R/W
LSB of conversion interval timer
1
TMR1
R/W
MSB of conversion interval timer
00 = Convert only once
01 = Every 1024 clock periods (512 μs)
10 = Every 2048 clock periods (1.024 ms)
11 = Every 16384 clock periods (8.19 ms)
2
REF
R/W
Selects internal or external reference
0 = Internal reference
1 = External reference
3
POL
R/W
Indicates polarity of signal on STOPACQ pin
0 = Active low
1 = Active high
4
FCD0
R/W
LSB of first conversion delay
5
FCD1
R/W
MSB of first conversion delay
This delay occurs before the first conversion after powering up the ADC, before converting the X and Y
coordinate channels to allow settling, and after the last conversion to allow PENIRQ precharge.
00 = 1 clock period delay (500 ns)
01 = 256 clock periods delay (128 μs)
10 = 2048 clock periods delay (1.024 ms)
11 = 16384 clock periods delay (8.19 ms)
6
PM0
R/W
LSB of ADC power management code
7
PM1
R/W
MSB of ADC power management code
00 = ADC and reference powered down continuously
01 = ADC and reference* powered down when not converting
10 = ADC and reference* powered up continuously
11 = ADC powered down when not converting, reference* powered up
*Irrespective of PM bits, reference is always powered down, if REF bit is 1.
8
ACQ0
R/W
LSB of ADC acquisition time
9
ACQ1
R/W
MSB of ADC acquisition time
00 = 4 clock periods (2 μs)
01 = 8 clock periods (4 μs)
10 = 16 clock periods (8 μs)
11 = 32 clock periods (16 μs)
10
AVG0
R/W
LSB of ADC averaging code
11
AVG1
R/W
MSB of ADC averaging code
00 = No averaging (1 conversion per channel)
01 = 4 measurements per channel averaged
10 = 8 measurements per channel averaged
11 = 16 measurements per channel averaged
Rev. A | Page 36 of 44
Bit Name
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