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參數(shù)資料
| 型號： | TLV2556MPWREPG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 11-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
| 封裝： | GREEN, PLASTIC, TSSOP-20 |
| 文件頁數(shù)： | 15/37頁 |
| 文件大小： | 705K |
| 代理商： | TLV2556MPWREPG4 |
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Timing Information
DATA OUT
1
2
3
5
4
6
10
11
12
1
I/O CLOCK
HiZ State
DATA IN
8
7
9
D7
16
D3
D2
D1
D0
Configure CFGR1
1st Conversion Cycle
CS
First Cycle After Power-Up: Configure CFGR2
Access Cycle
Data Cycle
Invalid Conversion Data
Command 1111
CFGR2 Data
Timing Diagrams
1
2
3
5
4
6
10
11
12
1
MSB1 MSB2 MSB3 MSB4 MSB5
MSB8 MSB9 LSB+1
LSB
HiZ State
2
3
D6
D5
D4
D3
D2
D1
D0
D6
D5
D7
8
7
9
MSB6 MSB7
D7
Previous Conversion Data
MSB
MSB2
MSB1
Shift in New Multiplexer Address,
Simultaneously Shift Out Previous Conversion Result
Access
Cycle
Sample Cycle
Channel
Address
A/D Conversion Interval
Output Data
Format
tconv
CS
I/O
CLOCK
DATA
OUT
DATA
IN
EOC
Initialize
INT
SLAS598A – NOVEMBER 2008 – REVISED JULY 2009 ................................................................................................................................................... www.ti.com
PARAMETER MEASUREMENT INFORMATION (continued)
Figure 45. Timing for CFGR2 Configuration
The host must configure CFGR2 before valid device conversions can begin. This can be accessed through
command 1111. This can be done using 8, 12, or 16 I/O CLOCK clocks. (A minimum of 8 is required to fully
program CFGR2.)
After CFGR2 is configured, the following cycle configures CFGR1 and a valid sample/conversion is performed.
CS can be held low for each remaining cycle. First valid conversion output data is available on the third cycle
after power up.
A.
To minimize errors caused by noise at CS, the internal circuitry waits for a setup time after the CS falling edge before
responding to control input signals. Therefore, no attempt should be made to clock in an address until the minimum
CS setup time has elapsed.
Figure 46. Timing for 12-Clock Transfer Using CS With DATA OUT Set for MSB First
22
Copyright 2008–2009, Texas Instruments Incorporated
Product Folder Link(s): TLV2556-EP
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