參數(shù)資料
型號: AD7148ACPZ-1REEL
廠商: Analog Devices Inc
文件頁數(shù): 25/57頁
文件大小: 0K
描述: IC CAP-TO-DGTL CONV PROG 16LFCSP
標準包裝: 5,000
類型: 電容性
觸摸面板接口: 2 線
輸入數(shù)/鍵: 8
分辨率(位): 16 b
數(shù)據接口: I²C,串行
數(shù)據速率/采樣率 (SPS,BPS): 250k
電壓基準: 內部
電源電壓: 2.6 V ~ 3.3 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 16-VQFN 裸露焊盤,CSP
供應商設備封裝: 16-LFCSP
包裝: 帶卷 (TR)
AD7148
Rev. A | Page 30 of 56
AC
K
WRITE
S
P
OUTPUT FROM MASTER
OUTPUT FROM AD7142
AC
K
6-BIT DEVICE
ADDRESS
REGISTER ADDR
[15:8]
REGISTER ADDR
[7:0]
WRITE DATA
HIGH BYTE [15:8]
WRITE DATA
LOW BYTE [7:0]
WRITE DATA
HIGH BYTE [15:8]
WRITE DATA
LOW BYTE [7:0]
ACK
READ DATA
HIGH BYTE [15:8]
READ DATA
LOW BYTE [7:0]
S = START BIT
P = STOP BIT
SR = REPEATED START BIT
ACK = ACKNOWLEDGE BIT
ACK = NO ACKNOWLEDGE BIT
AC
K
W
AC
K
AC
K
AC
K
ACK
READ (USING REPEATED START)
S
ACK
6-BIT DEVICE
ADDRESS
REGISTER ADDR
HIGH BYTE
REGISTER ADDR
LOW BYTE
6-BIT DEVICE
ADDRESS
READ DATA
HIGH BYTE [15:8]
ACK
W
ACK
READ DATA
LOW BYTE [7:0]
0715
5-
0
39
R
SR
P
AC
READ DATA
HIGH BYTE [15:8]
READ DATA
LOW BYTE [7:0]
K
AC
K
READ (WRITE TRANSACTION SETS UP REGISTER ADDRESS)
K
S
AC
6-BIT DEVICE
ADDRESS
REGISTER ADDR
HIGH BYTE
REGISTER ADDR
LOW BYTE
6-BIT DEVICE
ADDRESS
READ DATA
HIGH BYTE [15:8]
AC
W
K
AC
K
AC
K
READ DATA
LOW BYTE [7:0]
R
P
S
ACK
Figure 40. Example of Sequential I2C Write and Readback Operation
This arrangement allows the AD7148 to be connected directly
to processors whose supply voltage is less than the minimum
operating voltage of the AD7148 without the need for external
level-shifters. The VDRIVE pin can be connected to voltage
supplies as low as 1.65 V and as high as VCC.
VDRIVE INPUT
The supply voltage to all pins associated with the I2C serial
interface (SCLK, SDA) is separate from the main VCC supplies
and is connected to the VDRIVE pin.
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