DS2434 데이터 시트보기 (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS2434

Battery Identification Chip

Dallas Semiconductor -> Maxim Integrated 

DS2434

MEMORY FUNCTION EXAMPLE Table 2

Example: Bus Master writes 24 bytes of data to DS2434 scratchpad, then copies to it to NV1.

MASTER MODE DATA (LSB FIRST)

COMMENTS

TX

Reset

Reset pulse (480-960 µs)

RX

Presence

Presence pulse

TX

17h

Issue "write scratchpad" command

TX

00h

Start address

TX

<24 bytes>

Write 24 bytes of data to scratchpad

TX

Reset

Reset pulse

RX

Presence

Presence pulse

TX

11h

Issue "read scratchpad" command

TX

00h

Start address

RX

<24 data bytes> Read scratchpad data and verify

TX

Reset

Reset pulse

RX

Presence

Presence pulse

TX

22h

Issue "copy SP1 to NV1" command

RX

<busy indicator> Wait until NVB in status register=0 (10 ms typical)

TX

Reset

Reset pulse

RX

Presence

Presence pulse, done

MEMORY FUNCTION EXAMPLE Table 3

Example: Bus Master initiates temperature conversion, then reads temperature.

MASTER MODE DATA (LSB FIRST)

COMMENTS

TX

Reset

Reset pulse (480-960 µs)

RX

Presence

Presence pulse

TX

D2h

Issue "convert T" command

TX

Reset

Reset pulse

RX

Presence

Presence pulse

TX

B2h

Issue "read registers" command; begin loop

TX

62h

Status register address

RX

<1 data byte>

Read status register and loop until TB=0

TX

Reset

Reset pulse

RX

Presence

Presence pulse

TX

B2h

Issue "read registers" command

TX

61h

Temperature register address

RX

<1 data byte>

Read temperature register

TX

Reset

Reset pulse

RX

Presence

Presence pulse, done

1-WIRE BUS SYSTEM

The DS2434 1-Wire bus is a system which has a single bus master and one slave. The DS2434 behaves as

a slave. The DS2434 is not able to be multidropped, unlike other 1-Wire devices from Dallas

Semiconductor.

The discussion of this bus system is broken down into three topics: hardware configuration, transaction

sequence, and 1-Wire signaling (signal types and timing).

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