Datasheet

ADS8634
ADS8638
SBAS541A –MAY 2011– REVISED AUGUST 2011 www.ti.com
REGISTER MAP: ADS8634
The ADS8634 internal registers are mapped in two pages: page 0 and page 1. Page 0 is selected by default at
power-up and after reset. Any register read/write action while on page 0 addresses the page 0 registers. Writing
01h to register address 7Fh selects page 1 for any further register operations.
Page 0 registers are used to select the channel sequencing mode, program the configuration registers, and to
read the alarm flags. Page 1 resisters are used to program the alarm thresholds for each channel and for the
temperature sensor. Table 13 details page 0 and Table 14 details page 1.
Table 13. Page 0 Register Map for the ADS8634
REGISTER
DEFAULT
REGISTER ADDRESS BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
VALUE
(1)
BITS[15:9]
Channel Sequencing Control Registers
Sel Temp
Manual 04h 00h 0 Channel Select[1:0] X
(2)
Range Select[2:0]
Sensor
Sel Temp
Auto 05h 00h Reset-Seq 0 0 0 Range Select[2:0]
Sensor
Holding DIN line continuously (equivalent to writing zero to all sixteen bits) during device operation as per Figure 85 continues device operation in the last selected mode (auto/manual)
Configuration Registers
Reset-Device 01h 00h 0 0 0 0 0 0 0 Reset-Dev
Temp
AL_PD Int V
REF
Aux-Config 06h 08h 0 0 0 0 Sensor 0
Control Enable
Enable
Auto-Md Ch-Sel 0Ch 00h Sel Ch0 X Sel Ch1 X Sel Ch2 X Sel Ch3 X
Ch0 Range 10h 11h 0 Range Select Ch0[2:0] 0 X X X
Ch1 Range 11h 11h 0 Range Select Ch1[2:0] 0 X X X
Ch2 Range 12h 11h 0 Range Select Ch2[2:0] 0 X X X
Ch3 Range 13h 11h 0 Range Select Ch3[2:0] 0 X X X
Alarm Flags (Read-Only)
Tripped Tripped Active Alarm Active Alarm
Alarm Flag Alarm Flag Flag Flag
Temp-Flag 20h 00h 0 0 0 0
Temperature Temperature Temperature Temperature
Low High Low High
Tripped Tripped Tripped Tripped
Ch0-1 Tripped-Flag 21h 00h Alarm Flag Alarm Flag X X Alarm Flag Alarm Flag X X
Ch0 Low Ch0 High Ch1 Low Ch1 High
Active Alarm Active Alarm Active Alarm Active Alarm
Ch0-1 Active-Flag 22h 00h Flag Ch0 Flag Ch0 X X Flag Ch1 Flag Ch1 X X
Low High Low High
Tripped Tripped Tripped Tripped
Ch2-3 Tripped-Flag 23h 00h Alarm Flag Alarm Flag X X Alarm Flag Alarm Flag X X
Ch2 Low Ch2 High Ch3 Low Ch3 High
Active Alarm Active Alarm Active Alarm Active Alarm
Ch2-3 Active-Flag 24h 00h Flag Ch2 Flag Ch2 X X Flag Ch3 Flag Ch3 X X
Low High Low High
Page Selection Register
Page 7Fh 00h 0 0 0 0 0 0 0 Page Addr
(1) All registers are reset to the default values at power-on or at device reset using the register settings method.
(2) X = don't care.
50 Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated
Product Folder Link(s): ADS8634 ADS8638