L9788 datasheet(177/264 Pages) STMICROELECTRONICS

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DS12308 Rev 4

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L9788

Micro second channel (MSC) interface

263

Micro second channel (MSC) interface

18.1

Function description

The Micro Second Channel interface is an adapted high performance serial bus for power

switch device.

L9788 has one Micro Second Channel slave controller capable of receiving up to 35 MHz

downstream and transmitting up to 2.18 MBaud upstream.

MSC Clock is supported with synchronous continuous mode. Master clock and data are

implemented by LVDS. Slave data out signal is implemented by LVTTL.

Figure 81. MSC communication timing diagram

Conditions:

5.5 V ≤ VB_IN ≤ 18 V, 4.75 V ≤ VDD_IO ≤ 5.25 V, Tj -40 to 175 °C unless otherwise

specified.

MSC_CK

tCK

tCKhigh

tCKlow

tsetup thold

tswitch

tENhold

tENsetup

tSDOdelay

Active phase

Passive phase

MSC_DI

MSC_EN

MSC_DO

GADG1212161611PS

Table 85. MSC communication timing parameters

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

tCK

Cycle time

Tested by SCAN/

tsetup

Data setup time

Tested by SCAN/

thold

Data hold time

Tested by SCAN/

tswitch

Switching time switching time

for CL, EN and SI measured

between 0.1*VVDD3 and

0.9*VVDD3

Tested by SCAN/

tCKlow

CK low time

Tested by SCAN/

7.5

tCKhigh

CK high time

Tested by SCAN/

7.5

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