L9945 datasheet(23/151 Pages) STMICROELECTRONICS

23 / 151 page

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 12. SDO pin electrical characteristics

Symbol

Parameter

Test condition

Min.

Max.

Unit

tsdo_trans

SDO Rise and Fall time

CLOAD = 20 to 150 pF

tpcld

Propagation delay – incl. Rise/Fall time

(SCLK to data at SDO active)

CLOAD = 150 pF

tcsdv

NCS = LOW to output SDO active

CLOAD = 150 pF

tpchdz

NCS L/H to SDO @ high impedance

CIN_SPI

Input capacitance at SDI; SDO; SCLK;

NCS

VSDOH

High output level

ISDO = -2 mA

VIO - 0.4 V

VSDOL

Low output level

ISDO = 3.2 mA

0.4

ISDO_Leak

Tri state leakage current

NCS = HIGH;

0 < VSDO < VIO – 0.3 V

-5

µA

NCS = HIGH;

VSDO = VIO – 0.3 V

-5

µA

NCS = HIGH;

VSDO = VIO

µA

VOV_SDO

Over voltage detection threshold at SDO

output (for reverse supply protection)

Prevent output from damage; avoid back supply to

VIO; no hysteresis required

VIO + 0.05 VIO + 0.2

tOV_SDO_fil

Overvoltage detection analog filter time

100

700

tOFF_PROT_OV

Overvoltage detection HS turn OFF/ON

time at SDO.

Includes analog filter time and comparator reaction

time until 50% IOVpeak_SDO_HS

0.5

μs

IOVpeak_SDO_HS

Maximum possible peak reverse current

at SDO HS before protection Turn Off

VSDO = 36 V; VIO = 3 V; limited by RDSON only;

HS channel On

250

Note:

The SDO pin electrical characteristics are also reported in the SPI table. SDO PCB trace must be routed

carefully in order avoid spikes on SDO pin, which may generate an overvoltage failure. A pull-down resistor in

the [10 - 47] kΩ range on SDO pin is also recommended.

5.3

Reset

The device is reset by the following two events:

Power On Reset (POR)

•

0 ≤ VDD5 ≤ VPOR:

–

Logic is reset;

–

Outputs are in three-state, diagnostics regulators for open load detection are OFF;

–

No violation of leakage current requirements;

–

Charge pump is disabled.

L9945

Reset

DS12275 - Rev 8

page 23/151

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