參數(shù)資料
型號(hào)： AD7877ACPZ-REEL
廠商： Analog Devices Inc
文件頁數(shù)： 31/45頁
文件大小： 0K
描述： IC ADC 12BIT TOUCHSCREEN 32LFCSP
標(biāo)準(zhǔn)包裝： 5,000
類型： 電阻
觸摸面板接口： 4 線
輸入數(shù)/鍵： 1 TSC
分辨率（位）： 12 b
評(píng)估套件： 可供
數(shù)據(jù)接口： 串行，SPI?
數(shù)據(jù)速率/采樣率 (SPS，BPS)： 125k
電壓基準(zhǔn)： 外部，內(nèi)部
電源電壓： 2.7 V ~ 5.25 V
電流 - 電源： 1µA
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 32-VFQFN 裸露焊盤，CSP
供應(yīng)商設(shè)備封裝： 32-LFCSP-VQ
包裝： 帶卷 (TR)
配用： EVAL-AD7877EBZ-ND - BOARD EVALUATION FOR AD7877
AD7877
Data Sheet
Rev. D | Page 36 of 44
Register Name: Control Register 2
Write Address: 0010
Read Address:
00010
Default Value:
0x000
Type:
Read/write
Table 17.
Bit
Name
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 s)
10 = every 2048 clock periods (1.024 ms)
11 = every 16,384 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 s)
10 = 2048 clock periods delay (1.024 ms)
11 = 16,384 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
For the following codes, regardless of PM bits, the reference is always powered down if the REF bit is 1:
01 = ADC and reference powered down when not converting
10 = ADC and reference powered up continuously (master sequencer does not work if PM = 10)
11 = ADC powered down when not converting, reference powered up
8
ACQ0
R/W
LSB of ADC acquisition time
9
ACQ1
R/W
MSB of ADC acquisition time
00 = 4 clock periods (2 s)
01 = 8 clock periods (4 s)
10 = 16 clock periods (8 s)
11 = 32 clock periods (16 s)
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
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