DS2438 データシートの表示（PDF） - Maxim Integrated
部品番号
コンポーネント説明
メーカー
DS2438 Datasheet PDF : 29 Pages
| |||
ORDERING INFORMATION
PART
MARKING
DS2438Z+
DS2438Z+T&R
DS2438AZ+
DS2438AZ+T&R
DS2438Z
DS2438Z/T&R
DS2438AZ
DS2438AZ/T&R
+ Denotes lead-free package.
DS2438
DS2438
DS2438A
DS2438A
DS2438
DS2438
DS2438A
DS2438A
PACKAGE INFORMATION
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
DS2438
DETAILED PIN DESCRIPTION
PIN
SYMBOL DESCRIPTION
1
GND Ground
2
VSENS+ Battery Input: connection for battery current to be monitored (see text)
3
VSENS- Battery Input: connection for battery current to be monitored (see text)
4
VAD
ADC Input: input for general purpose A/D
5
VDD
VDD Pin: input supply voltage
6, 7
NC
No Connect
8
DQ
Data Input/Out: for 1-Wire operation: Open drain
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.
2 of 29
Share Link: 