ASC7521A Просмотр технического описания (PDF) - Unspecified

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Компоненты Описание

производитель

ASC7521A

LOW- OLTAGE 1-WIRE DIGITAL TEMPERATURE SENSOR

Unspecified 

aSC7521A

SST Interface

Multi Client Mode

Sensors operate in multi-client mode for read bit timing. Reference the SST Specification Version 1.0 for details.

SST Device Commands

GetDIB() Command (0xF7)

Read the Device Identifier Block (DIB). The read length of the command is either 8 or 16 bytes. 8 bytes is the minimum number of

bytes populated by a fixed address discoverable client.

Write Data Length:

Read Data Length:

Command Code:

0x01

0x08/0x10

0xF7

Note: Un-shaded table entries are created by the host. Shaded entries are the response bytes from the aSC7521A to the host.

# Bits

Host Sending

Hex Value

# Bits

aSC7521A Sending

Hex Value

8

Target Address

0x48

8

Write Length

0x01

8

Read Length

0x10

8

GetDIB Cmd

0xF7

8

FCS

0xDC

8

DIB Byte 1

(data)

8

…

(data)

8

DIB Byte 15

(data)

8

DIB Byte 16

(data)

8

FCS

(data dependent)

Figure 3. GetDIB() Command (16-byte read length)

8

Target Address

0x48

8

Write Length

0x01

8

DIB Byte 1

(data)

8

…

(data)

8

Read Length

0x08

8

DIB Byte 7

(data)

8

GetDIB Cmd

0xF7

8

FCS

0x23

8

DIB Byte 8

(data)

8

FCS

(data dependent)

Figure 4. GetDIB() Command (8-byte read length)

Ping() Command

The Ping() command provides a safe means for software to verify that a device is responding at a particular address.

Write Data Length:

Read Data Length:

Command Code:

8

Target Address

0x48

0x00

0x00

none

8

Write Length

0x00

8

Read Length

0x00

8

FCS

0xD7

© Andigilog, Inc. 2006

Figure 5. Example of Ping()

-6-

www.andigilog.com

October 2006 - 70A05011

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