DS620 Datasheet, PDF (13/15 Pages) Dallas Semiconductor – Low-Voltage, +-0.5°C Accuracy Digital Thermometer and Thermostat

DS620 Digital Thermometer and Thermostat
COPYING TO EEPROM COMMAND SEQUENCE
Data is written to DS620 and then copied from SRAM to EEPROM
BUS
MASTER
MODE
TX
TX
RX
TX
RX
TX
RX
TX
RX
TX
RX
TX
RX
TX
TX
RX
TX
RX
TX
RX
TX
TX
RX
TX
RX
TX
TX
RX
TX
DS620
MODE
RX
RX
TX
RX
TX
RX
TX
RX
TX
RX
TX
RX
TX
RX
RX
TX
RX
TX
RX
TX
RX
RX
TX
RX
TX
RX
RX
TX
RX
DATA
(MSB
FIRST)
START
<address, 0>
ACK
A4h
ACK
<data>
ACK
<data>
ACK
<data>
ACK
<data>
ACK
START
<address, 0>
ACK
ACh
ACK
xxxxxxx0b
ACK
START
<address, 0>
ACK
51h
ACK
START
<address, 0>
ACK
ACh
COMMENTS
Bus master initiates a START condition.
Bus master sends DS620 address, R/W = 0.
DS620 generates acknowledge bit.
Bus master sends the address location of the first byte
of data to be written. (In this case the first byte of user
EEPROM).
DS620 generates acknowledge.
Bus master sends one byte of data to the SRAM
location for EEPROM address A4h.
DS620 generates acknowledge.
Bus master sends one byte of data to the SRAM
location for EEPROM for address A5h.
DS620 generates acknowledge.
Bus master sends one byte of data to the SRAM
location for EEPROM for address A6h.
DS620 generates acknowledge.
Bus master sends one byte of data to the SRAM
location for EEPROM for address A7h.
DS620 generates acknowledge.
Bus master generates a repeated start condition.
Bus master sends DS620 address, R/W = 0.
DS620 generates acknowledge.
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. NOTE: Sequence numbers 17
through 23 need to be done only if DS620 is in 1SHOT
mode: 1SHOT = 1.
DS620 generates acknowledge.
Bus master writes to the configuration register putting
the DS620 in continuous conversion mode: 1SHOT =
0.
DS620 generates acknowledge.
Bus master generates a repeated start condition.
Bus master sends DS620 address, R/W = 0.
DS620 generates acknowledge
Master sends START CONVERT command to DS620
to start temperature conversions.
DS620 generates acknowledge bit and begins
conversions.
Bus master generates a repeated start condition.
Bus master sends DS620 address, R/W = 0.
DS620 generates acknowledge.
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. NOTE: command sequence
numbers 29 through 34 need only be done if a return to
1SHOT mode operation is needed.
SEQUENCE
NUMBER
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
13 of 15