DS2438Z+ Maxim Integrated Products, DS2438Z+ Datasheet - Page 14

IC MONITOR SMART BATTERY 8-SOIC

DS2438Z+

Manufacturer Part Number
DS2438Z+
Description
IC MONITOR SMART BATTERY 8-SOIC
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of DS2438Z+

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)
Operating Supply Voltage
2.4 V to 10 V
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Charge Safety Timers
No
Mounting Style
SMD/SMT
Temperature Monitoring
No
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
DS2438
MEMORY/CONTROL FUNCTIONS FLOWCHART Figure 6 (continued)
MEMORY MAP
The DS2438’s memory is organized as shown in Figure 7. The memory consists of a scratchpad RAM
and storage SRAM/EEPROM. The scratchpad helps insure data integrity when communicating over the
1-Wire bus. Data is first written to the scratchpad where it can be read back. After the data has been
verified, a copy scratchpad command will transfer the data to the appropriate page in memory (pages 0-2
are primarily volatile SRAM, pages 3-7 are EEPROM). This process insures data integrity when
modifying the memory.
The DS2438’s memory is organized as 64 bytes of memory, in eight 8-byte pages. Each page has its own
scratchpad space, organized as 8 bytes of memory. When reading a scratchpad, there is a 9th byte which
may be read with a Read Scratchpad command. This byte contains a cyclic redundancy check (CRC)
byte, which is the CRC over all of the 8 bytes in the currently selected scratchpad. This CRC is
implemented in the fashion described in the section titled “CRC Generation.”
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