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Hardware/Software Interface
20BL51E00 E2

2020-03-27 Page 87
5.1.2.3 Odometer, Photocoupler, Relay Signals SMB Register ( 0x44 )
Table 73. SMB Register (
0x44
)
Table 74. Odometer switching voltage levels
The odometer input has the following default and reset states:
Bit 7 6 5 4 3 2 1 0
Name
-
ODO_PU_
EN
ODO
_PD150K
_EN
ODO
_PD75K
_EN
OPT_EN
[2]
OPT_EN
[1]
REL_EN
[2]
REL_EN
[1]
Access
W W W W W W W
Reset
1 1 1 1 1 1 1 1
Bit Field Description
6 ODO_PU_EN Enable pull-up resistor of the odometer interface

0: Pull-up resistor active

1: Pull-up resistor inactive
5 ODO_PD150K
_EN
Enable 150K pull-down resistor of the odometer interface

0: Pull-down resistor active

1: Pull-down resistor inactive
4 ODO_PD75K
_EN
Enable 75K pull down resistor of the odometer interface

0: Pull-down resistor active

1: Pull-down resistor inactive
3:2 OPT_EN[2:1] Enable photocoupler output

0: Photocoupler closed (enabled)

1: Photocoupler open (disabled)
1:0 REL_EN[2:1] Enable relay output

0: NO (normally open, make contact)

1: NC (normally closed, break contact)
ODO_PD75K
_EN
ODO_PD150K
_EN
High Level Low Level
1 1 4.2 V 1.5 V
1 0 8.4 V 3.0 V
0 1 12.6 V 4.5 V
0 0 16.8 V 6 V