DS2438Z/T&R Maxim Integrated Products, DS2438Z/T&R Datasheet - Page 2

• Manufacturer Part Number: DS2438Z/T&R
• Description: IC MONITOR SMART BATTERY 8-SOIC
• Manufacturer: Maxim Integrated Products

Specifications of DS2438Z/T&R

• 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

ORDERING INFORMATION
+ Denotes lead-free package.
DETAILED PIN DESCRIPTION
OVERVIEW
The block diagram of Figure 1 shows the seven major components of the DS2438:
1. 64-bit lasered ROM
2. temperature sensor
3. battery voltage A/D
4. battery current A/D
5. current accumulators
6. elapsed time meter
7. 40-byte nonvolatile user-memory
Each DS2438 contains a unique 64-bit lasered ROM serial number so that several battery packs can be
charged/monitored by the same host system. Furthermore, other Dallas products featuring the same
1-Wire bus architecture with a 64-bit ROM can reside on the same bus; refer to the Dallas Automatic
Identification Data book for the specifications of these products.
Communication to the DS2438 is via a 1-Wire port. With the 1-Wire port, the memory and control
functions will not be available until the ROM function protocol has been established. The master must
first provide one of four ROM function commands: 1) Read ROM, 2) Match ROM, 3) Search ROM, or 4)
Skip ROM. These commands operate on the 64-bit lasered ROM portion of each device and can singulate
a specific device if many are present on the 1-Wire line as well as to indicate to the bus master how many
and what types of devices are present. After a ROM function sequence has been successfully executed,
the memory and control functions are accessible and the master may then provide any one of the six
memory and control function commands.
DS2438Z+
DS2438Z+T&R
DS2438AZ+
DS2438AZ+T&R
DS2438Z
DS2438Z/T&R
DS2438AZ
DS2438AZ/T&R
PIN
6, 7
1
2
3
4
5
8
PART
SYMBOL
V
V
GND
V
V
NC
DQ
SENS+
SENS-
AD
DD
DESCRIPTION
Ground
Battery Input: connection for battery current to be monitored (see text)
Battery Input: connection for battery current to be monitored (see text)
ADC Input: input for general purpose A/D
V
No Connect
Data Input/Out: for 1-Wire operation: Open drain
MARKING
DD
DS2438A
DS2438A
DS2438A
DS2438A
DS2438
DS2438
DS2438
DS2438
Pin: input supply voltage
8-Pin SOIC
DS2438Z+ on Tape-and-Reel
8-Pin SOIC
DS2438AZ+ on Tape-and-Reel
8-Pin SOIC
DS2438Z on Tape-and-Reel
8-Pin SOIC
DS2438AZ on Tape-and-Reel
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PACKAGE INFORMATION