Environmental Monitoring and Control Device
Datasheet
3. The Interrupt status registers are cleared on a read if no events are active.
4. The INTEN bit in register 7Ch is always writeable, both when the start bit is set and when the lock bit
is set.
8.1
8.2
Undefined Registers
The registers shown in the table above are the defined registers in the part. Any reads to undefined
registers always return 00h. Writes to undefined registers have no effect and do not return an error.
Register 10h: SMSC Test Register
BIT 7
(MSB)
7
BIT 0
(LSB)
0
REGISTER
ADDRESS
READ/
WRITE
R/W
REGISTER
NAME
SMSC TEST
DEFAULT
VALUE
BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1
10h
6
5
4
3
2
1
00h
Setting the Lock bit has no effect on this register.
This register must not be written. Writing this register may produce unexpected results.
8.3
Register 1E, 1Fh: Offset Registers
BIT 7
(MSB)
7
BIT 0
(LSB)
0
REGISTER
ADDRESS
READ/
WRITE
R/W
R/W
REGISTER
NAME
Offset Register 2
Offset Register 1
DEFAULT
VALUE
BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1
1Eh
1Fh
6
6
5
5
4
4
3
3
2
2
1
1
00h
00h
7
0
These registers become read only when the Lock bit is set. Any further attempts to write to these registers
shall have no effect.
Offset Register 2
Only applies to the remote diode temperature reading 2. This register contains a 2's complement value
which is added (or subtracted if the number is negative) to external temperature reading 2. The default
value in the offset register is zero, so initially zero is always added to the temperature reading.
Offset Register 1
Applies to the remote diode temperature reading 1 or the ambient reading. This register contains a 2's
complement value which is added (or subtracted if the number is negative) to either the internal or external
temperature 1 reading. The default value in the offset register is zero, so initially zero is always added to
the temperature reading. The offset register is configured for the external temperature 1 channel by
default. It may be switched to the internal channel by setting bit 4 of the Special Function Register to 1.
8.4
Registers 20-24h, 70-72h: Voltage 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
20h
21h
R
R
2.5V
Vccp
7
7
6
6
5
5
4
4
3
3
2
2
1
1
0
0
N/A
N/A
SMSC EMC6D100/EMC6D101
Page 40
Rev. 09-09-04
DATASHEET
SMSC [ SMSC CORPORATION ]
