L9945 datasheet(40/151 Pages) STMICROELECTRONICS

40 / 151 page

Table 25. Internal oscillator electrical characteristics

Symbol

Parameter

Test condition

Min.

Typ.

Max. Unit

fMAIN_CLK1

Clock Frequency

MHz

tolMAIN_CLK

Tolerance of frequency of internal clock oscillator

Spread spectrum disabled;

4.5 V < VVDD5 ≤ 36 V

-7.7 fMAIN_CLK1

7.7

fMOD_range_MAIN Clock frequency modulation range spread spectrum enabled

-4

fMOD_MAIN

Spread spectrum modulation frequency

kHz

5.8

Digital I/Os

Table 1 reports each pin functionality, along with the pull-up/pull-down implementation. Back supply current into

any digital pin is not allowed.

For detailed information about the functionality of the SPI related pins (SCK, SDI, SDO, NCS), refer to Serial

Peripheral Interface (SPI). For the electrical characteristics of the SDO output refer to VIO supply pin & SDO pin

characteristics.

For detailed information about the functionality of the reset pin (NRES), refer to Reset.

For detailed information about the functionality of the channel control pins (NONx and EN6), refer to Output pre-

drivers.

For detailed information about the functionality of the device disable pins (DIS and NDIS), refer to Disable

sources.

5.8.1

Digital I/Os electrical characteristics

The table below lists the electrical characteristics for the digital pins.

Note:

Tj = Tj_op; VVPS_UV < VVPS < 60 V, all supplies are independent; 4.5 V < VDD5 < 5.5 V; 3.0 V < VIO < 5.5 V,

unless otherwise noted.

Table 26. Digital I/Os electrical characteristics

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

VIN_L

Low input level

0.75

VIN_H

High input level

1.75

VIN_HYS

Hysteresis

0.1

0.5

IPU

Input pull-up current source

NONx, NRES, DIS, NCS, SDI, SCK

-30

-100

µA

IPD

Input pull-down current sink

NDIS, EN6

100

µA

tFIL_a

Filter time

Applies to NRES, DIS, NDIS

0.5

5.0

μs

VNDISL

Low output level for NDIS bidirectional pin

VDD5 > VPOR; INDIS = 5 mA

0.4

Note:

The NDIS bidirectional pin features internal protection against overvoltage when used as output. Such electrical

characteristics are listed in the DIS & NDIS pins paragraph.

L9945

Digital I/Os

DS12275 - Rev 8

page 40/151

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