參數(shù)資料
型號： ADS7953SRHBT
廠商： TEXAS INSTRUMENTS INC
元件分類： ADC
英文描述： 16-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PQCC32
封裝： GREEN, PLASTIC, PQFP-32
文件頁數(shù)： 26/63頁
文件大?。?/td> 1734K
代理商： ADS7953SRHBT
Deviceinanyoperationmode
Yes
No
CS
Entryinto Auto 1
register
programming
sequence
CS
Auto 1 register
programming
Program Auto1register?
SDI:DI15..12=1000
(Deviceenters Auto1programmingsequence)
SDI:DI15..0aspertables4,5
Endof Auto1registerprogramming
SLAS605A – JUNE 2008 – REVISED JANUARY 2010
www.ti.com
The Auto-1 Program Register is programmed (once on powerup or reset) to pre-select the channels for the
Auto-1 sequence. Auto-1 Program Register programming requires two CS frames for complete programming. In
the first CS frame the device enters the Auto-1 register programming sequence and in the second frame it
programs the Auto-1 Program Register. Refer to Table 2, Table 3, and Table 4 for complete details.
NOTE: The device continues its operation in selected mode during programming. SDO is valid, however it is not possible to
change the range or write GPIO data into the device during programming.
Figure 52. Auto-1 Register Programming Flowchart
Table 3. Program Register Settings for Auto-1 Mode
DESCRIPTION
RESET
BITS
STATE
LOGIC STATE
FUNCTION
FRAME 1
DI15-12
NA
1000
Device enters Auto-1 program sequence. Device programming is done in the next frame.
DI11-00
NA
Do not care
FRAME 2
DI15-00
All 1s
1 (individual bit)
A particular channel is programmed to be selected in the channel scanning sequence. The
channel numbers are mapped one-to-one with respect to the SDI bits; e.g.
DI15
→ Ch15, DI14 → Ch14 … DI00 → Ch00
A particular channel is programmed to be skipped in the channel scanning sequence. The
0 (individual bit)
channel numbers are mapped one-to-one with respect to the SDI bits; e.g.
DI15
→ Ch15, DI14 → Ch14 … DI00 → Ch00
Table 4. Mapping of Channels to SDI Bits for 16,12,8,4 Channel Devices
Device(1)
SDI BITS
DI15
DI14
DI13
DI12
DI11
DI10
DI09
DI08
DI07
DI06
DI05
DI04
DI03
DI02
DI01
DI00
16 Chan
1/0
12 Chan
X
1/0
8 Chan
X
1/0
4 Chan
X
1/0
(1)
When operating in Auto-1 mode, the device only scans the channels programmed to be selected.
32
Copyright 2008–2010, Texas Instruments Incorporated
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