LM89CIM NSC [National Semiconductor], LM89CIM Datasheet - Page 14

• Manufacturer Part Number: LM89CIM
• Manufacturer: NSC [National Semiconductor]

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2.0 LM89 Registers
2.2 LOCAL and REMOTE TEMPERATURE REGISTERS (LT, RTHB, RTLB)
For LT and RTHB D7–D0: Temperature Data. LSB = 1˚C. Two’s complement format.
For RTLB D7–D5: Temperature Data. LSB = 0.125˚C. Two’s complement format.
The maximum value available from the Local Temperature register is 127; the minimum value available from the Local
Temperature register is -128. The maximum value available from the Remote Temperature register is 127.875; the minimum value
available from the Remote Temperature registers is −128.875.
2.3 STATUS REGISTER (SR)
Power up default is with all bits “0” (zero).
D0: LCRIT: When set to “1” indicates a Local Critical Temperature alarm.
D1: RCRIT: When set to “1” indicates a Remote Diode Critical Temperature alarm.
D2: OPEN: When set to “1” indicates a Remote Diode disconnect.
D3: RLOW: When set to “1” indicates a Remote Diode LOW Temperature alarm
D4: RHIGH: When set to “1” indicates a Remote Diode HIGH Temperature alarm.
D5: LLOW: When set to “1” indicates a Local LOW Temperature alarm.
D6: LHIGH: When set to “1” indicates a Local HIGH Temperature alarm.
D7: Busy: When set to “1” ADC is busy converting.
2.4 CONFIGURATION REGISTER
Power up default is with all bits “0” (zero)
D7: ALERT mask: When set to “1” ALERT interrupts are masked.
(Read Address 03h /Write Address 09h):
ALERT mask
Read Address
<
P7:P0
B0h-BEh
Command Select Address
D7
BFh
FEh
FFh
12h
13h
14h
19h
20h
21h
>
(Read Only Address 02h):
hex
Busy
D7
RUN/STOP
Write Address
<
D6
P7:P0
B0h-BEh
(Read Only Address 00h, 01h):
(Read Only Address 10h):
BFh
12h
13h
14h
19h
20h
21h
NA
NA
LHIGH
Value
Value
BIT
BIT
>
D6
hex
(Continued)
SIGN
D5
0.5
0
D7
D7
LLOW
<
D5
LM89-1 0011 0100
D7:D0
LM89 0011 0001
0000 0000
0000 0000
0000 0000
0101 0101
0000 1010
0000 0000
0000 0001
0110 1110
Power-On-Default State
0.25
D6
D6
64
>
T_CRIT_A
Remote
binary
RHIGH
mask
0.125
D4
D5
D5
D4
32
14
D4
D4
16
0
<
decimal
RLOW
D7:D0
D3
110
85
10
49
52
0
0
0
0
1
D3
0
D3
D3
8
0
>
OPEN
D2
D2
4
0
Register
D2
RTOLB
RHSLB
RLSLB
Name
RDTF
T_CRIT_A
RMID
RDR
RCS
LCS
TH
Local
mask
D2
D1
D1
2
0
RCRIT
Remote Temperature Offset Low
Byte
Remote HIGH Setpoint Low Byte
Remote LOW Setpoint Low Byte
Remote T_CRIT Setpoint
Local T_CRIT Setpoint
T_CRIT Hysteresis
Manufacturers Test Registers
Remote Diode Temperature Filter
Read Manufacturer’s ID
Read Stepping or Die Revision
Code
D1
D0
D0
1
0
Register Function
D1
0
LCRIT
D0
Fault Queue
D0