Rainbow Electronics DS1629 - Manual (Page 16)

DS1629
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Access TH [A1h]
If R/ W 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/
W is "1", the value stored in this
register is read back.
Access TL [A2h]
If R/ W 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/
W 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/
W 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
1
st
byte after the 32
nd
is read/written and ACK’d by the master/slave. Refer to Figure 6 for command
protocol.
DS1629 Command Set Table 8
INSTRUCTION PROTOCOL DESCRIPTION 2-wire bus data after
issuing protocol
NOTES
CONFIGURATION / MEMORY COMMANDS
Writes to 8-bit configuration register 1 data byte
Access
Configuration
ACh Reads from configuration/status
register 1 or 2 data bytes 1, 5
Writes to SRAM array Starting Address+N-
bytes Access
Memory
17h
Read from SRAM array Starting Address+N-
bytes
1, 2
THERMOMETER COMMANDS
Start
Convert T EEh Initiates temperature conversion(s) Idle 3
Stop
Convert T 22h Terminates continuous conversions Idle 3
Read
Temperature AAh Reads Temperature Register Read 1 or 2 data bytes 4
Read Counter A8h Reads COUNT_REMAIN Read 1 data byte
Read Slope A9h Reads COUNT_PER_C Read 1 data byte
Access TH A1h Writes to/Reads from TH register Write 2 data bytes
Read 1 or 2 data bytes
1, 5
Access TL A2h Writes to/Reads from TL register Write 2 data bytes
Read 1 or 2 data bytes
1, 5
CLOCK COMMANDS
Access Clock C0h Sets/Reads Clock Starting Address + N-
bytes
1, 2
Access Clock
Alarm C7h Sets/
Reads Clock Alarm Starting Address + N-
bytes
1, 2