SN8F5708 datasheet(156/204 Pages) SONIX

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SN8F5708 Series

I2C

Datasheet Rev. 2.4

156

22.6

System Management Bus Extension

The optional System Management Bus (SMBus) protocol hardware supports 3 types timeout

detection: (1) Tmext Timeout Detection: The cumulative stretch clock cycles within one byte.

(2)Tsext Timeout Detection: The cumulative stretch clock cycles between start and stop condition.

(3)Timeout Detection: The clock low measurement.

Timeout detection is controlled by SMBSEL and SMBDST registers. The SMBEXE bit of SMBSEL is

SMBus extension function enable bit. When SMBEXE=1, SMBus extension function is enabled.

Otherwise, Disable SMBus extension function. Timeout type and period setting is controlled by

SMBTOP[2:0] and SMBDST. The period of SMBus timeout is controlled by three 16-bit buffers of

Tmex, Tsext and Tout. The equation is as following.

Tmext/Tsext/Tout =

Timeout Period(sec)xFcpu(Hz)

1024

Tmext is support by two 8-bit register of Tmext_L and Tmext_H . Tmext_L hold the low byte and

Tmext_H hold high byte. Tsext is support by two 8-bit register of Tsext_L and Tsext_H . Tsext_L hold

the low byte and Tsext_H hold high byte. Tout is support by two 8-bit register of Tout_L and

Tout_H . Tout_L hold the low byte and Tout_H hold high byte.

Type

Time out period

Fcpu=8MHz

DEC

HEX

Tmext

5ms

Tsext

25ms

195

Tout

35ms

273

111

By the setting of SMBTOP[2:0] to choose register type (as the table below), and write to register by

write data to SMBDST register.

SMBTOP[2:0]

SMBDST

Description

000

Tmext_L

Select the low byte of Tmext register.

001

Tmext_H

Select the high byte of Tmext register.

010

Tsext_L

Select the low byte of Tsext register.

011

Tsext_H

Select the high byte of Tsext register.

100

Tout_L

Select the low byte of Tout register.

101

Tout_H

Select the high byte of Tout register.

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