QST108 datasheet(22/38 Pages) STMICROELECTRONICS

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Device operating modes

QST108

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Low power mode description

Free Run in Detect (Bit 6)

1: Low power mode is suspended when detection is on-going.

0: Low power mode is authorized.

Sleep Duration Factor (Bits 5 to 0)

This value is between 1 and 62, in hexadecimal format. The Sleep duration is ‘Sleep

Duration Factor’ x 20 milliseconds.

0x00: Low power mode is disabled.

0x3F: Sleep is entered immediately with an infinite duration (deep sleep).

Note:

When the device is in sleep, any I2C bus activity will wake up the device. If many ‘sleeping’

devices share the same bus, then any bus activity will wake up all of them.

The command sent to wake up the device is always lost (not acknowledged). The Master

device will have to repeat this command.

AKS group mode description

AKSGrpnMode

Defines the type of AKS for the Group n:

0: Locking AKS

1: Unlocking AKS

AKS group selection description

Grpx

The selected key is a member of AKS Group x.

Table 15.

SetLowPower

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Free Run

in Detect

Sleep Duration Factor

Table 16.

AKSGrpnMode

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

AKSGrp8

Mode

AKSGrp7

Mode

AKSGrp6

Mode

AKSGrp5

Mode

AKSGrp4

Mode

AKSGrp3

Mode

AKSGrp2

Mode

AKSGrp1

Mode

Table 17.

KeynGrp

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Grp8

Grp7

Grp6

Grp5

Grp4

Grp3

Grp2

Grp1

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