Environmental Monitoring and Control Device
Datasheet
BIT 7
(MSB)
BIT 0
(LSB)
REGISTER
ADDRESS
READ/
WRITE
REGISTER
NAME
DEFAULT
VALUE
BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1
22h
23h
24h
70h
71h
72h
R
R
R
R
R
R
3.3V
5V
12V
+3.3V
+1.5V
+1.8V
7
7
7
7
7
7
6
6
6
6
6
6
5
5
5
5
5
5
4
4
4
4
4
4
3
3
3
3
3
3
2
2
2
2
2
2
1
1
1
1
1
1
0
0
0
0
0
0
N/A
N/A
N/A
N/A
N/A
N/A
Note: registers 70h-72h are only applicable to the EMC6D100.
The Voltage Reading registers reflect the current voltage of the EMC6D100/EMC6D101 voltage monitoring
inputs. Voltages are presented in the registers at ¾ full scale for the nominal voltage, meaning that at
nominal voltage, each register will read C0h.
Table 8.1 - Voltage vs. Register Reading
REGISTER
READING AT
NOMINAL
REGISTER
READING AT
MAXIMUM
REGISTER
READING AT
MINIMUM
NOMINAL
VOLTAGE
MAXIMUM
VOLTAGE
MINIMUM
VOLTAGE
INPUT
VOLTAGE
VOLTAGE
VOLTAGE
1.5V
1.5V
1.8V
2.5V
2.25V
3.3V
3.3V
5.0V
12.0V
C0h
C0h
C0h
C0h
C0h
C0h
C0h
C0h
1.99V
2.39V
3.32V
3.00V
4.38V
4.38V
6.64V
16.00V
FFh
FFh
FFh
FFh
FFh
FFh
FFh
FFh
0V
0V
0V
0V
0V
0V
0V
0V
00h
00h
00h
00h
00h
00h
00h
00h
1.8V
2.5V
Vccp
VCC
3.3V
5V
12V
The Voltage Reading registers will be updated automatically by the EMC6D100/EMC6D101 Chip with a
minimum frequency of 4Hz. These registers are read only – a write to these registers has no effect.
8.5
Registers 25-27h: Temperature Reading
BIT 7
(MSB)
BIT 0
(LSB)
REGISTER
ADDRESS
READ/
WRITE
REGISTER
NAME
DEFAULT
VALUE
BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1
25h
26h
27h
R
R
R
Processor
7
7
7
6
6
6
5
5
5
4
4
4
3
3
3
2
2
2
1
1
1
0
0
0
N/A
N/A
N/A
(Zone1) Temp
Internal
(Zone2) Temp
Remote
(Zone3) Temp
The Temperature Reading registers reflect the current temperatures of the internal and remote diodes.
Processor (Zone1) Temp register reports the temperature measured by the Remote1- and Remote1+ pins,
Remote (Zone3) Temp register reports the temperature measured by the Remote2- and Remote2+ pins
and the Internal (Zone2) Temp register reports the temperature measured by the internal (ambient)
temperature sensor. Current temperatures are represented as 8 bit, 2’s complement, signed numbers in
Celsius, as shown below in Table 8.2. The Temperature Reading register will return a value of 80h if the
remote diode pins are not implemented by the board designer or are not functioning properly (this
corresponds to the diode fault interrupt status bits). The Temperature Reading registers will be updated
automatically by the EMC6D100/EMC6D101 Chip with a minimum frequency of 4Hz. These registers are
read only – a write to these registers has no effect.
SMSC EMC6D100/EMC6D101
Page 41
Rev. 09-09-04
DATASHEET
SMSC [ SMSC CORPORATION ]
