L9177ATR datasheet(7/55 Pages) STMICROELECTRONICS

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Electrical specifications

2.1

Operating range

The device may not operate properly if maximum operating conditions are exceeded.

Table 2. Operating conditions

Parameter

Value

Unit

VB, VB_1 supply voltage

6 to 18 (1)

I/O logic

0 to VDD

Stepper motor outputs

-0.3 to VB, VB_1

Low side outputs

-0.3 to clamp voltage

1. See Section 2.1.1 .

2.1.1

Supply voltage

•

Below 3.9 V the device is in a safety state (internal circuitries are on but all the outputs are off).

•

From 3.9 V to 5.5 V (Functionalities during Crank phase):

–

Reset function; VDD > 3.3 V (rds-on state) IVDD = 100 mA; 3.3 V < VDD_TRK < VDD (rds-on state);

–

Low-sides, K-Line, H-Bridge OFF if Reset = 0; SPI not available, internal registers resetted if Reset = 0;

–

All Diagnosis disabled if Reset = 0; VRS function limited (Vdiff max = 1000 mV)

•

From 5.5 V to 6 V (low battery):

–

All the functions are granted with the following degraded parameters; VDD > 4.510 V; Tracking error <

100 mV (Iload = 40 mA, rds-on state).

•

From 6 V to 18 V: normal operating range

•

From 18 V to VB_off:

–

All the functions are granted with increased power dissipation and no reset is asserted during transient.

•

From VB_off to 40 V (internal circuitries are on but all the outputs are off):

–

The device is on and in a safety state.

2.2

Absolute maximum ratings

Maximum ratings are absolute ratings; exceeding any one of these values may cause permanent damage to the

integrated circuit.

Table 3. Absolute maximum ratings

Parameter

Condition

Min

Max

Unit

DC supply voltage

pin VB/VB_1

-0.3

I/O low voltage pins(1)

-0.3

I/O low voltage digital pins (2)

-0.3

VDD+0.3

I/O power pins voltage range (3)

-0.3 Clamp voltage

TACH pin

-0.3

OUTA-D

-0.3

VB +0.3

KEY pin

To be protected with R_key to limit sourced/

sinked current to ± 5 mA in dc conditions

and ±20 mA during transients

-0.3

L9177A

Electrical specifications

DS12175 - Rev 5

page 7/55

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