Datasheet

LM63
SNAS190E –SEPTEMBER 2002–REVISED MAY 2013 www.ti.com
Table 9. Remote Diode Temperature, Offset And Setpoint Registers
ADDRESS READ/ POR
BITS NAME DESCRIPTION
HEX WRITE VALUE
This is the MSB of the 2’s complement value, representing the
Remote Diode temperature of the remote diode connected to the LM63. Bit 7 is the
01 Read Only 7:0 N/A Temperature sign bit, bit 6 has a weight of 0x40 (64°), and bit 0 has a weight of 1°C.
Reading (MSB) This byte to be read first. The LM63C and LM63D will report the actual
thermal diode temperature.
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
Remote Diode
7:5 N/A
weight 0.5°C, bit 6 has a weight of 0.25°C, and bit 5 has a weight of
10 Read Only Temperature
0.125°C.
Reading (MSB)
4:0 00 Always 00.
Remote These registers contain the value added to or subtracted from the
11 R/W 7:5 00 Temperature remote diode’s reading to compensate for the different non-ideality
OFFSET (MSB) 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
Remote
7:5 00
temperature reading contained in registers 01 and 10.
12 R/W Temperature
4:0 00 OFFSET (LSB) Always 00.
0x46 Remote HIGH
07 (0D) R/W 7:0
High setpoint temperature for remote diode. Same format as Remote
(70°C) Setpoint (MSB)
Temperature Reading (registers 01 and 10).
7:5 00
Remote HIGH
13 R/W
Setpoint (LSB)
4:0 00 Always 00.
00 Remote LOW
08 (0E) R/W 7:0
Low setpoint temperature for remote diode. Same format as Remote
(0°C) Setpoint (MSB)
Temperature Reading (registers 01 and 10).
7:5 00
Remote LOW
14 R/W
Setpoint (LSB)
4:0 00 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
0x55 Remote Diode
19 R/W 7:0 (bit 1) in the Configuration register to a 1, then programming a new
(85°C) T_CRIT Limit
T_CRIT value into this register. The T_CRIT Limit can not be changed
again except by cycling power to the LM63.
Remote Diode 8-bit integer storing T_CRIT hysteresis. T_CRIT stays activated until
0x0A
21 R/W 7:0 T_CRIT the remote diode temperature goes below [(T_CRIT Limit)—(T_CRIT
(10°C)
Hysteresis Hysteresis)].
7:3 00000 These bits are unused and should always set to 0.
00: Filter Disabled
Remote Diode
01: Filter Level 1 (minimal filtering, same as 10)
2:1 00 Temperature
10: Filter Level 1 (minimal filtering, same as 01)
Filter
BF R/W 11: Filter Level 2 (maximum filtering)
0: the ALERT/Tach pin functions normally.
Comparator 1: the ALERTTach pin behaves as a comparator, asserting itself when
0 0
Mode an ALERT condition exists, de-asserting itself when the ALERT
condition goes away.
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