參數(shù)資料
型號： ADS7953SBRHBT
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)： 31/63頁
文件大?。?/td> 1734K
代理商： ADS7953SBRHBT
www.ti.com
SLAS605A – JUNE 2008 – REVISED JANUARY 2010
Table 9. Alarm Program Register Settings (continued)
DESCRIPTION
BITS
RESET STATE
LOGIC
FUNCTION
STATE
DI15-14
NA
cc
Where “cc” represents the lower two bits of the channel number in binary format. The device
programs the alarm for the channel represented by the binary number “bbcc”. Note that “bb” is
programmed in the first frame.
DI13
NA
1
High alarm register selection
0
Low alarm register selection
DI12
NA
0
Continue alarm programming sequence in next frame
1
Exit Alarm Programming in the next frame. Note: If the alarm programming sequence is not
terminated using this feature then the device will remain in the alarm programming sequence
state and all SDI data will be treated as alarm thresholds.
DI11-10
NA
xx
Do not care
DI09-00
All ones for high
This 10-bit data represents the alarm threshold. The 10-bit alarm threshold is compared with the upper 10-bit
alarm register
word of the 12-bit conversion result. The device sets off an alarm when the conversion result is higher (High
and all zeros for
Alarm) or lower (Low Alarm) than this number. For 10-bit devices, all 10 bits of the conversion result are
low alarm register compared with the set threshold. For 8-bit devices, all 8 bits of the conversion result are compared with DI09
to DI02 and DI00, 01 are 'do not care'.
PROGRAMMING GPIO REGISTERS
NOTE
GPIO 1 to 3 are available only in TSSOP packaged devices. The QFN device offers
'GPIO 0' only. As a result, all references related to 'GPIO 0' only are valid in the case
of QFN package devices.
The device has four General Purpose Input and Output (GPIO) pins. Each of the four pins can be independently
programmed as General Purpose Output (GPO) or General Purpose Input (GPI). It is also possible to use the
GPIOs for some pre-assigned functions (refer to Table 10 for details). GPO data can be written into the device
through the SDI line. The device refreshes the GPO data on every CS falling edge as per the SDI data written in
the previous frame. Similarly, the device latches GPI status on the CS falling edge and outputs it on SDO (if GPI
is read enabled by writing DI04 = 1 during the previous frame) in the same frame starting on the CS falling edge.
The details regarding programming the GPIO registers are illustrated in the flowchart in Figure 56. Table 10 lists
the details regarding GPIO Register programming settings.
Copyright 2008–2010, Texas Instruments Incorporated
37
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