ADS7950_12 Datasheet, PDF (38/65 Pages) Texas Instruments – 12/10/8-Bit, 1 MSPS, 16/12/8/4-Channel, Single-Ended, MicroPower, Serial Interface ADCs

ADS7950, ADS7951, ADS7952, ADS7953
ADS7954, ADS7955, ADS7956, ADS7957
ADS7958, ADS7959, ADS7960, ADS7961
SLAS605A – JUNE 2008 – REVISED JANUARY 2010
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CS
Device in any operation mode
No
Program GPIO register?
Yes
CS
GPIO register
programming
SDI: DI15..12 = 0100
Refer table 9 for DI11..00 data
End of GPIO register programming
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 56. GPIO Program Register Programming Flowchart
Table 10. GPIO Program Register Settings
BITS
RESET
STATE
LOGIC
STATE
DESCRIPTION
FUNCTION
DI15-12 NA
0100
Device selects GPIO Program Registers for programming.
DI11-10 00
00
Do not program these bits to any logic state other than ‘00’
DI09
0
1
Device resets all registers in the next CS frame to the reset state shown in the corresponding tables (it
also resets itself).
0
Device normal operation
DI08
0
1
Device configures GPIO3 as the device power-down input.
0
GPIO3 remains general purpose I or O. Program 0 for QFN packaged devices.
DI07
0
1
Device configures GPIO2 as device range input.
0
GPIO2 remains general purpose I or O. Program 0 for QFN packaged devices.
DI06-04 000
000
GPIO1 and GPIO0 remain general purpose I or O. Valid setting for QFN packaged devices.
xx1
Device configures GPIO0 as ‘high or low’ alarm output. This is an active high output. GPIO1 remains
general purpose I or O. Valid setting for QFN packaged devices.
010
Device configures GPIO0 as high alarm output. This is an active high output. GPIO1 remains general
purpose I or O. Valid setting for QFN packaged devices.
100
Device configures GPIO1 as low alarm output. This is an active high output. GPIO0 remains general
purpose I or O. Setting not allowed for QFN packaged devices.
110
Device configures GPIO1 as low alarm output and GPIO0 as a high alarm output. These are active high
outputs. Setting not allowed for QFN packaged devices.
Note: The following settings are valid for GPIO which are not assigned a specific function through bits DI08..04
DI03
0
1
GPIO3 pin is configured as general purpose output. Program 1 for QFN packaged devices.
0
GPIO3 pin is configured as general purpose input. Setting not allowed for QFN packaged devices.
DI02
0
1
GPIO2 pin is configured as general purpose output. Program 1 for QFN packaged devices.
0
GPIO2 pin is configured as general purpose input. Setting not allowed for QFN packaged devices.
DI01
0
1
GPIO1 pin is configured as general purpose output. Program 1 for QFN packaged devices.
0
GPIO1 pin is configured as general purpose input. Setting not allowed for QFN packaged devices.
DI00
0
1
GPIO0 pin is configured as general purpose output. Valid setting for QFN packaged devices.
38
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Product Folder Link(s): ADS7950, ADS7951, ADS7952, ADS7953 ADS7954, ADS7955, ADS7956, ADS7957 ADS7958,
ADS7959, ADS7960, ADS7961