DS620 Digital Thermometer and Thermostat
14 of 15
RX TX ACK DS620 generates acknowledge. 30
TX RX xxxxxxx1b
Bus master writes to the configuration register putting
the DS620 back in 1SHOT mode: 1SHOT = 1.
31
TX RX START Bus master generates a repeated start condition. 32
Bus master sends DS620 address, R/W = 0.
33
RX TX ACK DS620 generates acknowledge. 34
TX RX 48h
Master sends COPY DATA command to DS620 to
copy data in from SRAM memory to EEPROM memory.
35
RX TX ACK DS620 generates acknowledge. 36
TX RX START Bus master generates a repeated start condition. 37
Bus master sends DS620 address, R/W = 0.
38
RX TX ACK DS620 generates acknowledge. 39
TX RX 22h
Bus master sends a STOP CONVERT command to
stop the DS620 from continuously converting
temperature. NOTE: Bus master should ensure that
EEPROM copy operation is complete before executing
the STOP CONVERT command by either waiting 10ms
from the time of the COPY DATA command or
checking the NVB bit in configuration register
40
RX TX ACK DS620 generates acknowledge. 41
TX RX STOP
Bus master sends STOP condition to end
communication with DS620. (The bus master could
send a repeated start condition if additional
communication with the DS620 is desired.)
42
WRITING THE 1SHOT BIT COMMAND SEQUENCE
Configuring from continuous mode to 1SHOT mode.
BUS
MASTER
MODE
DS620
MODE
DATA
(MSB FIRST)
COMMENTS
SEQUENCE
NUMBER
TX RX START Bus master initiates a START condition. 1
Bus master sends DS620 address, R/W = 0.
2
RX TX ACK DS620 generates acknowledge bit. 3
TX RX 51h
Master sends START CONVERT command to DS620
to start temperature conversions.
4
RX TX ACK
DS620 generates acknowledge bit and begins
conversions.
5
TX RX START Bus master generates a repeated start condition. 6
Bus master sends DS620 address, R/W = 0.
7
RX TX ACK DS620 generates acknowledge. 8
TX RX ACh
Bus master sends the address location of the MSb of
the configuration register (contains the 1SHOT bit).
This writes to the SRAM location corresponding the
EEPROM location.
9
RX TX ACK DS620 generates acknowledge. 10
TX RX xxxxxxx1b
Bus master writes to the configuration register putting
the DS620 in 1SHOT mode: 1SHOT = 1.
11
RX TX ACK DS620 generates acknowledge. 12
TX RX START Bus master generates a repeated start condition. 13
Bus master sends DS620 address, R/W = 0.
14
RX TX ACK DS620 generates acknowledge. 15
TX RX 48h
Master sends COPY DATA command to DS620 to
copy data in from SRAM memory to EEPROM
memory.
16
