PD77728 datasheet(27/44 Pages) MICROCHIP

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PD77728

Application Information

Data Sheet

DS00003920E - 27

• OSS event (bit [1]) in register SUPPLY (registers 0x0A, 0x0B) and Supply Event (bit [7]) in the

Interrupt register (0x00) are set.

• Ports that are on and assigned as corresponding OSS code, are turned off

• Ports that are turned off, set the corresponding Power Good and Power Enable bits in the Power

• Ports that are not on and assigned with the corresponding OSS code, continue to perform

uninterrupted detection and classification.

The following figure shows the OSS pin Multi-Bit Priority Shutdown mode timing.

Figure 5-6. OSS Pin Multi-Bit Priority Shutdown Mode Timing

TOSS-BIT

25µs

TOSS-BIT

25µs

“0” (IDLE) to “1” to “0”

defines the start bit

3.3V

3 bits of data (each either “1” or “0”)

Priority group ports are ON

OFF

TOSS-BIT

25µs

TOSS-BIT

25µs

TOSS-OFF

TOSS-IDLE

TOSS-BIT

25µs

Priority group ports are OFF

The following table lists the OSS Pin Multi-Bit Priority Shutdown mode parameters.

Table 5-3. OSS Pin Multi-Bit Priority Shutdown Mode Parameters

Parameter

Description

Min.

Typ.

Max.

Unit

TBIT-OSS

OSS bit period

µs

TOSS-OFF

Time between receiving shutdown code

and shutting down of ports.

—

µs

TOSS-IDLE

Idle time between consecutive shutdown

code transmission in the Multi-Bit mode.

—

µs

Notes:

• If only one of the IC’s addresses is configured to multi-bit, then the configuration is applied on

both sub-chips.

• There is no support for single bit and multi bit on the same IC.

• In the Multi-Bit Priority mode, if OSS I/O has changed but a valid start-bit is not detected, then the

OSS event is discarded.

• OSS priority table is rebuilt every 3 ms. Therefore, it might take up to 3 ms for a new

configuration to take place.

• The OSS priority table is locked against changes during an OSS event.

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