LM63EVAL National Semiconductor, LM63EVAL Datasheet - Page 21

• Manufacturer Part Number: LM63EVAL
• Manufacturer: National Semiconductor

Specifications of LM63EVAL

• Lead Free Status / Rohs Status: Supplier Unconfirmed

ADDRESS
2.0 LM63 Registers
07 (0D)
08 (0E)
Remote Diode Temperature, Offset And Setpoint Registers
Hex
BF
01
10
11
12
13
14
19
21
Read/
Write
Read
Read
Only
Only
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bits
7:0
7:5
4:0
7:5
7:5
4:0
7:0
7:5
4:0
7:0
7:5
4:0
7:0
7:0
7:3
2:1
0
(70˚C)
(85˚C)
(10˚C)
00000
Value
(0˚C)
0x0A
POR
0x46
0x55
N/A
N/A
00
00
00
00
00
00
00
00
00
00
0
(Continued)
OFFSET (MSB)
Reading (MSB)
Reading (MSB)
OFFSET (LSB)
Setpoint (MSB)
Setpoint (MSB)
Setpoint (LSB)
Setpoint (LSB)
Remote Diode
Remote Diode
Remote Diode
Remote Diode
Remote Diode
Remote HIGH
Remote HIGH
Remote LOW
Remote LOW
T_CRIT Limit
Temperature
Temperature
Temperature
Temperature
Temperature
Comparator
Hysteresis
Remote
Remote
T_CRIT
Name
Mode
Filter
This is the MSB of the 2’s complement value, representing the
temperature of the remote diode connected to the LM63. Bit 7 is the sign
bit, bit 6 has a weight of 0x40 (64˚), and bit 0 has a weight of 1˚C. This
byte to be read first.
This is the LSB of the 2’s complement value, representing the
temperature of the remote diode connected to the LM63. Bit 7 has a
weight 0.5˚C, bit 6 has a weight of 0.25˚C, and bit 5 has a weight of
0.125˚C.
Always 00.
These registers contain the value added to or subtracted from the
remote diode’s reading to compensate for the different non-ideality
factors of different processors, diodes, etc. The 2’s complement value, in
these registers is added to the output of the LM63’s ADC to form the
temperature reading contained in registers 01 and 10.
Always 00.
High setpoint temperature for remote diode. Same format as Remote
Temperature Reading (registers 01 and 10).
Always 00.
Low setpoint temperature for remote diode. Same format as Remote
Temperature Reading (registers 01 and 10).
Always 00.
This 8-bit integer storing the T_CRIT limit is nominally 85˚C. This value
can be changed once after power-up by setting T_CRIT Limit Override
(bit 1) in the Configuration register to a 1, then programming a new
T_CRIT value into this register. The T_CRIT Limit can not be changed
again except by cycling power to the LM63.
8-bit integer storing T_CRIT hysteresis. T_CRIT stays activated until the
remote diode temperature goes below [(T_CRIT Limit) — (T_CRIT
Hysteresis)].
These bits are unused and should always set to 0.
00: Filter Disabled
01: Filter Level 1 (minimal filtering, same as 10)
10: Filter Level 1 (minimal filtering, same as 01)
11: Filter Level 2 (maximum filtering)
0: the ALERT/Tach pin functions normally.
1: the ALERTTach pin behaves as a comparator, asserting itself when
an ALERT condition exists, de-asserting itself when the ALERT condition
goes away.
21
Description
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