ATSGA204A View Datasheet(PDF) - Microchip Technology
Part Name
Description
MFG CO.
'ATSGA204A' PDF : 93 Pages View PDF
ATSHA204A
Single-Wire Interface
The device uses the selector byte within the configuration zone to determine which device stays awake.
Only that device with a selector value that matches the input parameter of the Pause command stays
awake. In order to facilitate late configuration of systems that use the multi-device sharing mode, the
following three update capabilities for the selector byte are supported:
1. Unlimited Updates
At any time, the UpdateExtra command can be executed to write the value in the selector field of
the Configuration zone. To enable this mode, set the SelectorMode byte in the Configuration zone
to zero.
2. One-time Field Update
If the SelectorMode byte is set to a non-zero value and the selector byte is set to a zero value prior
to locking the Configuration zone. Then, at any time after the Configuration zone is locked the
UpdateExtra command can be used one time to set Selector to a non-zero value. The
UpdateExtra command is not affected by the LockValue byte.
3. Fixed Selector Value
The selector byte can never be modified after the Configuration zone is locked if both SelectorMode
and Selector are set to non-zero values. The UpdateExtra command always returns an error
code.
5.5 Transaction Example
Host
Wake
Transmit
Wake (Single-Wire)
→
→
←
Device
Data
Host
Wake
Transmit
Command
Data
Transmit
Idle/Sleep
Example (Single-Wire)
→
→
←
→
→
→
←
→
Device
Data
Data
Table 5-3. Example (Single-Wire)
Host
Wake Token 0x00
Transmit 0x88
00010001
Count 0x04
Status 0x11
Device
0010000010001000
© 2018 Microchip Technology Inc.
DS40002025A-page 25
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