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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

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

byte after the 32

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

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

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 22

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