L5954 datasheet(11/15 Pages) STMICROELECTRONICS

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11 / 15 page

L5954

Functional description

Doc 17717 Rev 1

11/15

3.1.4

Overvoltage

The IC will not operate if the BAT voltage reaches 27 V typ. or above.

Figure 3.

Definition of timing on the I2C bus.

Figure 4.

Typical application circuit.

3.1.5

Write mode

S = START condition - SDA goes from high to low while SCL is high

A = Acknowledge - the device being written to, pulls down on data line (SDA) during the

acknowledge clock pulse.

P = STOP condition - SDA goes from low to high while SCL is high.

tBUP

SDA

SCL

tLOW

tHD;DAT

tSU;DAT

tSU;STA

tHD;STA

tSU;STO

D99AU1007

tSP

tHIGH

FBATT

VREF

C14

μF

C12

μF

C10

μF

1000

μF

0.1

μF

REG5

REG4

REG3

REG2

REG1

REG5

HSD1

ENABLE

BAT

VREF

SCL

SDA

GND

REG4

REG3

HSD2

HSD3

HSD1

HSD2

HSD3

D99AU1010A

REG2

REG1

(*) ESR of output capacitors should be between 0.1

Ω and 5.0Ω.

CHIP ADDRESS

DATA BYTE

MSB

LSB

MSB

LSB

Obsolete

Product(s)

- Obsolete

Product(s)

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