Environmental Monitoring and Control Device
Datasheet
8.15 Registers 44-4Dh, 73-78h: Voltage Limit Registers
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
2.5V Low Limit
2.5V High Limit
Vccp Low Limit
Vccp High Limit
VCC Low Limit
VCC High Limit
5V Low Limit
5V High Limit
12V Low Limit
12V High Limit
3.3V Low Limit
3.3V High Limit
1.5 Low Limit
1.5 High Limit
1.8 Low Limit
1.8 High Limit
44h
45h
46h
47h
48h
49h
4Ah
4Bh
4Ch
4Dh
73h
74h
75h
76h
77h
78h
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
00h
FFh
00h
FFh
00h
FFh
00h
FFh
00h
FFh
00h
FFh
00h
FFh
00h
FFh
Note: registers 73h-78h are applicable to the EMC6D100 only.
Setting the Lock bit has no effect on these registers.
If a voltage input either exceeds the value set in the voltage high limit register or falls below or equals the
value set in the voltage low limit register, the corresponding bit will be set automatically by the
EMC6D100/EMC6D101 in the interrupt status registers (41-42h, 7Dh). Voltages are presented in the
registers at ¾ full scale for the nominal voltage, meaning that at nominal voltage, each input will be C0h,
as shown in Table 8.4.
Table 8.4 – Voltage Limits vs. Register Setting
REGISTER
SETTING AT
NOMINAL
REGISTER
SETTING AT
MAXIMUM
VOLTAGE
REGISTER
SETTING AT
MINIMUM
NOMINAL
VOLTAGE
MAXIMUM
VOLTAGE
MINIMUM
VOLTAGE
INPUT
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
Note: The voltages 1.5V, 1.8V and 3.3V in the table above are applicable to the EMC6D100 only.
SMSC EMC6D100/EMC6D101
Page 49
Rev. 09-09-04
DATASHEET
SMSC [ SMSC CORPORATION ]
