LM81CIMTX-3 National Semiconductor, LM81CIMTX-3 Datasheet - Page 30

• Manufacturer Part Number: LM81CIMTX-3
• Manufacturer: National Semiconductor

Specifications of LM81CIMTX-3

• Monitored Voltage 1 (typ): 2.5/3.3/5/12V
• Battery Backup Switching: No
• Watchdog Timer: Yes
• Chip Enable Signals: No
• Manual Reset: No
• Package Type: TSSOP
• Operating Supply Voltage (min): 2.8V
• Operating Supply Voltage (max): 3.8V
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Power Fail Detection: No
• Mounting: Surface Mount
• Pin Count: 24
• Lead Free Status / Rohs Status: Not Compliant

www.national.com
2-3
Bit
0-2
4-7
Bit
0
4
5
6
7
1
3
Functional Description
13.14 Extended Mode Register 1 — Address 4Ch
Power on default –
13.15 Extended Mode Register 2 — Address 4Dh
Power on default –
Extended Mode
Enable
LOW Limit Mask
Bit
T_CRIT_A
Interrupt Mode
Select
T_CRIT_A
Enable
T_CRIT_A
Polarity
T_CRIT_A Mask
Enable
T_CRIT_A Status
Bit
Hysteresis Offset
Value
12-bit
Temperature
Resolution Enable
12-bit
Temperature Data
Name
Name
<
<
7:0
7:0
>
>
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read
Read/Write
Read/Write
= 0100 0100 binary
= 0000 0000 binary
Read/Write
Read/Write
Read Only
Read/Write
(Continued)
A one enables the Extended Interrupt Modes, the T_CRIT_A output and all the
functions listed in the Extended Mode Registers. Bit 7 of the Interrupt Status
register will be activated to reflect the interrupt status of the LOW limit comparison
result.
A mask bit for the LOW limit Interrupt. A one disables the interrupt from propagating
to the INT pin.
The state of these bits select the interrupt mode for T_CRIT_A as described below.
<
<
<
A one enables the T_CRIT_A pin.
A one sets the T_CRIT_A pin active HIGH. A zero sets the T_CRIT_A pin active
LOW.
A one prevents the T_CRIT_A interrupt from propagating to the INT output pin.
A one indicates that a T_CRIT_A interrupt has occurred.
T
A one sets the temperature resolution to 12 bits.
12-bit temperature data least significant bits. Bit 7 mirrors bit 7 in the temperature
configuration register (4Bh) and has a weight of 0.5˚C; bits 6-4 have a weight of
0.25, 0.125, and 0.0625˚C, respectively.
3:2
3:2
3:2
HYST
>
>
>
= 00 or
= 01: One-Time Interrupt Mode
= 10: Comparator Mode
value.
<
3:2
30
>
= 11: Repetitive Interrupt Mode
Description
Description