Texas Instruments ADS867 Series Manual page 63

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7 6
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 23. Channel n High Threshold LSB Register Field Descriptions
Bit Field
7-2 CHn_HT[7-2]
(n = 0 to 7 for the ADS8678;
n = 0 to 3 for the ADS8674)
1-0 CHn_HT[1-0]
(n = 0 to 7 for the ADS8678;
n = 0 to 3 for the ADS8674)
7 6
LEGEND: R/W = Read/Write; -n = value after reset
Table 24. Channel n Low Threshold MSB Register Field Descriptions
Bit Field
7-0 CHn_LT[15:8]
(n = 0 to 7 for the ADS8678;
n = 0 to 3 for the ADS8674)
Copyright © 2015, Texas Instruments Incorporated
Figure 120. Ch n High Threshold LSB Registers
5 4
CHn_HT[5:0]
R/W-1h
(n = 0 to 7 for the ADS8678; n = 0 to 3 for the ADS8674)
Type Reset
R/W 1h
R 0h
Figure 121. Ch n Low Threshold MSB Registers
5 4
CHn_LT[13:6]
(n = 0 to 7 for the ADS8678; n = 0 to 3 for the ADS8674)
Type Reset
R/W 0h
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3 2
Description
These bits set the LSB for the 14-bit channel n high alarm.
For example, bits 5-0 of the channel 0 register (address 17h) set
the LSB for the channel 0 high alarm threshold. The channel 0
high alarm threshold is AAFCh when bits 7-0 of the ch 0 high
threshold MSB register (address 16h) are set to AAh and bits 5-
0 of the ch 0 high threshold LSB register (address 17h) are set
to 11 1111.
00 0000 = LSB is 00h
00 0001 = LSB is 01h
00 0010 to 11 1110 = LSB is 02h to 3Eh
11 1111 = LSB is 3Fh
Read-only bit; internally set to 0
3 2
R/W-0h
Description
These bits set the MSB byte for the 14-bit channel n low alarm.
For example, bits 7-0 of the channel 0 register (address 18h) set
the MSB byte for the channel 0 low alarm threshold. The
channel 0 low alarm threshold is AAFCh when bits 7-0 of the ch
0 low threshold MSB register (address 18h) are set to AAh and
bits 5-0 of the ch 0 low threshold LSB register (address 19h) are
set to 11 1111.
0000 0000 = MSB byte is 00h
0000 0001 = MSB byte is 01h
0000 0010 to 1110 1111 = MSB byte is 02h to FEh
1111 1111 = MSB byte is FFh
ADS8674 ADS8678
ADS8674, ADS8678
SBAS627 – JULY 2015
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R-0h R-0h
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