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DS1629
 
16 of 23
 
write to or read from this register or the clock register is required to clear the clock alarm flag (CAF). See
Figure 6 for the protocol and Figure 4 for the clock alarm register map.
 
Access TH [A1h]
If R/
 is 0, this command writes to the TH register. After issuing this command, the next two bytes
written to the DS1629, in the format described for thermostat set-points, will set the high temperature
threshold for operation of the ALRM output and TAF/TAL flags. If R/
 is 1, the value stored in this
register is read back.
 
Access TL [A2h]
If R/
 is 0, this command writes to the TL register. After issuing this command, the next two bytes
written to the DS1629, in the format described for thermostat set-points, will set the high temperature
threshold for operation of the ALRM output and TAF flag. If R/
 is 1, the value stored in this register is
read back.
 
Access Memory [17h]
This command instructs the DS1629 to access the user-SRAM array, starting with the specified byte
address. Read/write depends upon the state of the R/
 in the 2-wire control byte. The user can read/write
all 32 bytes in succession within one command sequence, with the pointer automatically wrapping from
1Fh to 00h; if the master attempts to read/write more than 32 bytes, the address pointer will wrap to the
first byte after the 32nd is read/written and ACKed by the master/slave. See Figure 6 for command
protocol.
 
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