SABRE-LL-I datasheet(34/141 Pages) STMICROELECTRONICS

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Power saving modes

SABRE-LL-I

34/141

10.5

nAWAKE pin

At the start up, before S.A.B.Re has identified the required operation mode (see Chapter 8),

a current sink IINP is always active to pull down nAWAKE pin. As soon as the operation

mode (basic, slave, master or single device) is detected, the functionality of nAWAKE pin

will be different.

If S.A.B.Re is not configured as Slave device a current source IOUT will be active on this

pin, while the current sink IINP will be disabled. If S.A.B.Re is configured as a Slave device,

the current sink IINP will be active until nAWAKE pin is detected high for the first time; after

that both current sources IINP and IOUT will be disabled and the nAWAKE pin can be

considered as a digital input.

Here below is reported the nAWAKE pin simplified schematic.

Figure 6.

nAWAKE function block diagram

Table 16.

nAWAKE function specifications

Parameter

Description

Test condition

Min

Typ

Max

Unit

VIL

nAWAKE logic low threshold

0.8

VIH

nAWAKE logic high threshold

1.6

VHYS

nAWAKE input hysteresys

0.25

IOUT

nAWAKE pin output current

nAWAKE=0V(1)

Current is defined to be positive when flowing into the pin.

- 0.72

- 2

IINP

nAWAKE pin input current

nAWAKE=0.8V(1

)

0.2

0.4

tAWAKEFILT

Filter time

1.2

V3v3

IOUT

AWAKE_req

AWAKE

SlaveMode

nAWAKE seen high

for the first time after

start up.

IINP

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