DS1626/DS1726
Table 2. 12-BIT RESOLUTION TEMPERATURE/DATA RELATIONSHIP
DIGITAL OUTPUT
(BINARY)
DIGITAL OUTPUT
(HEX)
TEMPERATURE (°C)
+125
+25.0625
+10.125
+0.5
0111 1101 0000
0001 1001 0001
0000 1010 0010
0000 0000 1000
0000 0000 0000
1111 1111 1000
1111 0101 1110
1110 0110 1111
1100 1001 0000
7D0h
191h
0A2h
008h
000h
FF8h
F5Eh
E6Fh
C90h
0
-0.5
-10.125
-25.0625
-55
OPERATION—THERMOSTAT FUNCTION
The DS1626/DS1726 thermostat outputs (THIGH, TLOW, and TCOM) are updated after every temperature
conversion and remain at the updated values until the next conversion completes. THIGH is asserted when
the measured temperature is higher than or equal to the value stored in the TH register, and TLOW is
asserted when the temperature is equal to or falls below the value in the TL register (see Figure 5). TCOM
uses both TH and TL to provide programmable hysteresis: when the measured temperature equals or
exceeds TH, TCOM is asserted and it remains asserted until the temperature falls to a value equal to or
below TL. All three thermostat outputs are active-high outputs.
The Write TH and Write TL commands are used to program the 12-bit TH and TL registers with user-
defined two’s complement values. The MSb (bit 11) of each register contains the two’s complement sign
bit (S). For the TCOM thermostat output to function correctly, the TL value must be less than the TH value.
Any unused LSbs in the TH and TL registers are forced to 0 regardless of the data written to those bits.
The unused LSbs are determined by the conversion resolution set by R1 and R0 in the configuration
register. Therefore, for 9-bit conversions bits 2 through 0 will be 0, for 10-bit conversions bit 1 and bit 0
will be 0, and for 11-bit conversions bit 0 will be 0. All bits are used for 12-bit conversions, so no bits are
forced to 0. However, regardless of the conversion resolution, when writing to TH or TL at least 12 bits
must be sent following the Write TH or Write TL commands. The reason is that data written to TH and TL
is not saved to EEPROM until the DS1626/DS1726 have received 12 bits, so if the operation is
terminated before 12 bits have been received, the data will be lost. Any additional bits sent after the first
twelve are ignored (e.g., if two 8-bit words are written).
Another DS1626/DS1726 thermostat feature is the temperature-high flag (THF) and temperature-low flag
(TLF) in the configuration register. These bits provide a record of whether the temperature has been
greater than or equal to TH or less than or equal to TL at any time since the DS1626/DS1726 were
powered up. If the temperature is greater than or equal to the TH register value, the THF bit in the
configuration register will be set to 1. If the temperature is less than or equal to the TL register value, the
TLF bit in the configuration register will be set to 1. Once THF and/or TLF has been set, it will remain
set until the user overwrites it with a 0 or until the power is cycled.
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