DS2436 Dallas Semiconducotr, DS2436 Datasheet - Page 11

• Manufacturer Part Number: DS2436
• Description: Battery ID/Monitor Chip
• Manufacturer: Dallas Semiconducotr

TEMPERATURE REGISTERS (60h-61h)
The DS2436 can measure temperature without external components. The resulting temperature
measurement is placed in a 2-byte Temperature Register. This register is implemented in SRAM, and
therefore will hold data until the battery voltage falls below minimum V
The temperature reading is provided in a 13-bit, two’s complement format, with 0.03125°C resolution.
Table 1 describes the exact relationship of output data to measured temperature. The data is transmitted
serially over the 1-Wire interface. The DS2436 can measure temperature over the range of -40°C to
+85°C in 0.03125°C increments. For Fahrenheit usage, a lookup table or conversion factor must be used.
Note that temperature is represented in the DS2436 in terms of a 0.03125°C LSB, yielding the following
13-bit format:
The MSB of the Temperature Register contains the integer portion of temperature value.
TEMPERATURE/DATA RELATIONSHIPS Table 1
MSB
S
TEMPERATURE
+25.0625 C
-25.0625 C
+125 C
2
+1/2 C
-1/2 C
-55 C
6
0 C
2
5
2
4
2
3
DIGITAL OUTPUT (Binary)
2
2
01111101 00000000
00011001 00010000
00000000 10000000
00000000 00000000
11111111 10000000
11100110 11110000
11001001 00000000
2
1
Unit =1°C
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2
0
2
-1
2
-2
DD
DIGITAL OUTPUT (Hex)
.
2
-3
2
-4
7B00
FF80
E6F0
C900
1910
0080
0000
2
-5
0
0 0
DS2436
LSB