DS2438AZ Maxim Integrated Products, DS2438AZ Datasheet - Page 21

IC MONITOR SMART BATTERY 8-SOIC

DS2438AZ

Manufacturer Part Number
DS2438AZ
Description
IC MONITOR SMART BATTERY 8-SOIC
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of DS2438AZ

Function
Fuel, Gas Gauge/Monitor
Battery Type
Smart Batteries
Voltage - Supply
2.4 V ~ 10 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (0.154", 3.90mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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Recall Memory [B8hxxh]
This command recalls the stored values in EEPROM / SRAM page xxh to the scratchpad page xxh. This
command must proceed a Read SPxx command in order to read any page of memory on the DS2438.
Valid page numbers are 00h - 07h.
Convert T [44h]
This command begins a temperature conversion. No further data is required. The temperature conversion
will be performed, setting the TB flag in the Status/Configuration register to a “1” during conversion.
When the temperature conversion is done, the TB flag will clear to a “0”. If the bus master issues read
time slots following this command, the DS2438 will output “0” on the bus as long as it is busy making a
temperature conversion; it will return a “1” when the temperature conversion is complete.
Convert V [B4h]
This command instructs the DS2438 to initiate a voltage analog-to-digital conversion cycle. This sets the
ADB flag (see Status/Configuration register discussion in the Memory Map section). The voltage supply
that is measured is defined by the AD bit of the Status/Configuration register. When the A/D conversion
is done, the ADB flag is cleared and the current voltage value is placed in the VOLTAGE REGISTER of
page 00h. While an A/D conversion is taking place, all other memory functions are still available for use.
If the bus master issues read time slots following this command, the DS2438 will output “0” on the bus as
long as it is busy making a voltage measurement; it will return a “1” when the conversion is complete.
DS2438 COMMAND SET Table 11
INSTRUCTION
Write Scratchpad
Copy Scratchpad
Read Scratchpad
Recall Memory
Convert V
Convert T
Copies entire contents
Copies entire contents
Scratchpad page xxh
Initiates voltage A/D
of EEPROM/SRAM
Initiates temperature
to 8-byte EEPROM/
DS2438 Scratchpad
DESCRIPTION
of Scratchpad page
Reads bytes from
SRAM page xxh
Writes bytes to
page xxh to
Scratchpad
conversion
conversion
page xxh
page xxh
DS2438
xxh
REGISTER COMMANDS
MEMORY COMMANDS
PROTOCOL
BEh <page
4Eh <page
B8h<page
48h<page
00h-07h>
00h-07h>
00h-07h>
00h-07h>
B4h
21 of 29
44h
MASTER STATUS
Idle or Rx of NVB bit
Idle or Rx of ADB bit
AFTER ISSUING
Idle or Rx of TB bit
1-WIRE BUS
PROTOCOL
Idle
Rx
Tx
{NVB bit in Status
{ADB bit in Status
copy complete (2-
DATA AFTER
<write up to eight
Register = 1 until
Register = 1 until
Register = 1 until
{TB bit in Status
<read up to nine
1-WIRE BUS
PROTOCOL
bytes of data>
bytes of data>
10 ms, typ)}
ISSUING
conversion
conversion
complete}
complete}
Idle

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