Datasheet

LM63
www.ti.com SNAS190E –SEPTEMBER 2002–REVISED MAY 2013
POWER-ON RESET (POR) DEFAULT STATES
For information on the POR default states, see REGISTER MAP IN FUNCTIONAL ORDER.
TEMPERATURE DATA FORMAT
Temperature data can only be read from the Local and Remote Temperature registers. The High, Low and
T_CRIT setpoint registers are Read/Write.
Remote temperature data is represented by an 11-bit, two's complement word with a Least Significant Bit (LSB)
equal to 0.125°C. The data format is a left justified 16-bit word available in two 8-bit registers:
DIGITAL OUTPUT
TEMPERATURE
BINARY HEX
+125°C 0111 1101 0000 0000 7D00
+25°C 0001 1001 0000 0000 1900
+1°C 0000 0001 0000 0000 0100
+0.125°C 0000 0000 0010 0000 0020
0°C 0000 0000 0000 0000 0000
−0.125°C 1111 1111 1110 0000 FFE0
−1°C 1111 1111 0000 0000 FF00
−25°C 1110 0111 0000 0000 E700
−55°C 1100 1001 0000 0000 C900
Local Temperature data is represented by an 8-bit, two's complement byte with an LSB equal to 1°C:
DIGITAL OUTPUT
TEMPERATURE
BINARY HEX
+125°C 0111 1101 7D
+25°C 0001 1001 19
+1°C 0000 0001 01
0°C 0000 0000 00
−1°C 1111 1111 FF
−25°C 1110 0111 E7
−55°C 1100 1001 C9
OPEN-DRAIN OUTPUTS
The SMBDAT, ALERT, and PWM outputs are open-drain outputs and do not have internal pullups. A “High” level
will not be observed on these pins until pullup current is provided by an internal source, typically through a pullup
resistor. Choice of resistor value depends on several factors but, in general, the value should be as high as
possible consistent with reliable operation. This will lower the power dissipation of the LM63 and avoid
temperature errors caused by self-heating of the device. The maximum value of the pullup resistor to provide the
2.1 V high level is 88.7 kΩ.
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