ds2437 Maxim Integrated Products, Inc., ds2437 Datasheet - Page 21

• Manufacturer Part Number: ds2437
• Description: Smart Battery Monitor
• Manufacturer: Maxim Integrated Products, Inc.

NOTES:
1. Temperature conversion takes up to 1 second.
2. A/D conversion takes up to 2 ms.
3. EEPROM write takes up to 50 ms.
Sample Command Sequence Table 7
Example: Bus Master enables the ICA, CCA, and DCA on a single DS2437 and configures it such that
the CCA/DCA information is shadowed to EEPROM. The voltage A/D is configured such that the
DS2437 will perform voltage measurements on the battery (VDD) voltage.
MASTER MODE DATA (LSB FIRST)
INSTRUCTION
Convert V
Convert T
TX
RX
TX
TX
TX
TX
RX
TX
TX
RX
TX
RX
TX
TX
RX
TX
RX
Initiates voltage A/D
Initiates temperature
DESCRIPTION
<9 data bytes>
conversion
conversion
Read Slots
Presence
Presence
Presence
Presence
BEh00h
4Eh00h
48h00h
Reset
Reset
Reset
Reset
CCh
CCh
CCh
0Fh
REGISTER COMMANDS
Reset Pulse
Presence Pulse
Skip ROM
Issue Write SP 00h Command
Sets ICA, CA, E2?, AD Bits Active
Reset Pulse
Presence Pulse
Skip ROM
Issue Read SP 00h Command
Read Scratchpad Data and CRC
Reset Pulse
Presence Pulse
Skip ROM
Issue Copy SP 00h Command
DS2437 returns a 1 when Copy SP is complete
Reset Pulse
Presence Pulse, done
PROTOCOL
B4h
44h
21 of 31
STATUS AFTER
Idle or Rx of
Idle or Rx of
1-WIRE BUS
PROTOCOL
MASTER
ISSUING
ADB bit
TB bit
COMMENTS
1-WIRE BUS DATA
conversion complete}
conversion complete}
AFTER ISSUING
{ADB bit in Status
Register = 1 until
Register = 1 until
{TB bit in Status
PROTOCOL
DS2437