Datasheet

ADS8634
ADS8638
www.ti.com SBAS541A –MAY 2011– REVISED AUGUST 2011
CHANNEL N HA/LA MSB REGISTER
Bits[7:4] Chn-HA/LA Hysteresis[3:0]
These bits set the channel n high/low alarm hysteresis.
For example, bits[7:4] of the channel 6 HA MSB register (address 1Eh, page 1) set the channel 6 high alarm
hysteresis.
0000 = No hyeteresis
0001 = ±1LSB hystetesis
0010 to 1110 = ±2LSB to ±14LSB hystetesis
1111 = ±15-LSB hystetesis
Bits[3:0] Chn-HA/LA[11:8]
These bits set the MSB nibble for the 12-bit channel n high/low alarm.
For example, the channel 7 high alarm threshold is AFFh when bits[3:0] of the channel 7 HA MSB register (address
22h, page 1) are set to Ah and the channel 7 HA LSB (address 23h, page 1) register setting is FFh.
0000 = MSB nibble is 0h
0001 = MSB nibble is 1h
0010 to 1110 = MSB nibble is 2h to Eh
1111 = MSB nibble is Fh
CHANNEL N HA/LA LSB REGISTER
Bits[7:0] Chn HA[7:0]
These bits set the LSB byte for the 12-bit channel n high/low alarm.
For example, the channel 2 low alarm threshold is F01h when the channel 2 LA LSB register (address 0Dh, page 1)
setting is 01h and bits[3:0] of the channel 2 LA MSB (address 0Ch, page 1) are set to Fh.
0000 0000 = LSB byte is 0h
0000 0001 = LSB byte is 1h
0000 0010 to 1110 1111 = LSB byte is 02h to EFh
1111 1111 = LSB byte is FFh
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