LM3554 datasheet(6/47 Pages) TI1

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SCL

SDA_IN

SDA_OUT

LM3554

SNVS549C – JUNE 2009 – REVISED FEBRUARY 2016

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Electrical Characteristics (continued)

Unless otherwise specified, typical limits are for TA = 25°C, minimum and maximum limits in apply over the full operating

ambient temperature range (–30°C

≤ TA ≤ +85°C), VIN = 3.6 V, and VHWEN = VIN.

(1)(2)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VIN_TH

VIN monitor trip

threshold

VIN falling, VIN monitor register = 0x01

(enabled with VIN_TH = 3.1 V)

2.95

3.09

3.23

TX1/TORCH/GPIO1, STROBE, HWEN, ENVM/TX2/GPIO2 VOLTAGE

VIL

Input logic low

2.7 V

≤ VIN ≤ 5.5 V

0.4

VIH

Input logic high

2.7 V

≤ VIN ≤ 5.5 V

1.2

VIN

VOL

Output logic low

ILOAD = 3 mA, 2.7 V ≤ VIN ≤ 5.5 V

400

RTX1/TORC

Internal pulldown

resistance at

TX1/TORCH

300

Ω

RSTROBE

Internal pulldown

resistance at

STROBE

300

Ω

I2C-COMPATIBLE VOLTAGE SPECIFICATIONS (SCL, SDA)

VIL

Input logic low

2.7 V

≤ VIN ≤ 5.5 V

0.4

VIH

Input logic high

2.7 V

≤ VIN ≤ 5.5 V

1.22

VIN

VOL

Output logic low

(SCL)

ILOAD = 3 mA, 2.7 V ≤ VIN ≤ 5.5 V

400

6.6 Timing Requirements

See Figure 1.

MIN

NOM

MAX

UNIT

1 / t1

SCL clock frequency

400

kHz

Data in setup time to SCL high

100

Data out stable after SCL low

SDA low setup time to SCL low (start)

160

SDA high hold time after SCL high (stop)

160

Figure 1. I2C Timing

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