Datasheet

ADS8634
ADS8638
SBAS541A –MAY 2011– REVISED AUGUST 2011 www.ti.com
REGISTER MAP: ADS8638
The ADS8638 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 operation performed 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 read
the alarm flags. Page 1 resisters are used to program alarm thresholds for each channel and for the temperature
sensor. Table 11 details page 0 and Table 12 details page 1.
Table 11. ADS8638 Page 0 Register Map
REGISTER
DEFAULT
ADDRESS BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
VALUE
(1)
REGISTER BITS[15:9]
Channel Sequencing Control Registers
Sel Temp
Manual 04h 00h 0 Channel Select[2:0] Range Select[2:0]
Sensor
Sel Temp
Auto 05h 00h Reset-Seq 0 0 0 Range Select[2:0]
Sensor
Holding the DIN line low continuously (equivalent to writing '0' to all 16 bits) during device operation as per Figure 85 continues device operation in the last selected mode (auto or
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 Sel Ch1 Sel Ch2 Sel Ch3 Sel Ch4 Sel Ch5 Sel Ch6 Sel Ch7
Ch0-1 Range 10h 11h 0 Range Select Ch0[2:0] 0 Range Select Ch1[2:0]
Ch2-3 Range 11h 11h 0 Range Select Ch2[2:0] 0 Range Select Ch3[2:0]
Ch4-5 Range 12h 11h 0 Range Select Ch4[2:0] 0 Range Select Ch5[2:0]
Ch6-7 Range 13h 11h 0 Range Select Ch6[2:0] 0 Range Select Ch7[2:0]
Alarm Flag Registerss (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 Tripped Tripped Tripped Tripped
Ch0-3 Tripped-Flag 21h 00h Alarm Flag Alarm Flag Alarm Flag Alarm Flag Alarm Flag Alarm Flag Alarm Flag Alarm Flag
Ch0 Low Ch0 High Ch1 Low Ch1 High Ch2 Low Ch2 High Ch3 Low Ch3 High
Active Alarm Active Alarm Active Alarm Active Alarm Active Alarm Active Alarm Active Alarm Active Alarm
Ch0-3 Active-Flag 22h 00h Flag Ch0 Flag Ch0 Flag Ch1 Flag Ch1 Flag Ch2 Flag Ch2 Flag Ch3 Flag Ch3
Low High Low High Low High Low High
Tripped Tripped Tripped Tripped Tripped Tripped Tripped Tripped
Ch4-7 Tripped-Flag 23h 00h Alarm Flag Alarm Flag Alarm Flag Alarm Flag Alarm Flag Alarm Flag Alarm Flag Alarm Flag
Ch4 Low Ch4 High Ch5 Low Ch5 High Ch6 Low Ch6 High Ch7 Low Ch7 High
Active Alarm Active Alarm Active Alarm Active Alarm Active Alarm Active Alarm Active Alarm Active Alarm
Ch4-7 Active-Flag 24h 00h Flag Ch4 Flag Ch4 Flag Ch5 Flag Ch5 Flag Ch6 Flag Ch6 Flag Ch7 Flag Ch7
Low High Low High 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.
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