STLED325 datasheet(34/62 Pages) STMICROELECTRONICS

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Electrical ratings

STLED325

34/62

Doc ID 17576 Rev 1

4.2

Recommended operating conditions

4.2.1

DC electrical characteristics

(TA = -40 to +85 °C, VCC = 5.0 V ± 10%, GND = 0 V)

Table 12.

DC electrical characteristics

Symbol

Parameter

Test conditions

Min

Typ

Max

Uni

VCC

External supply voltage

4.5

5.0

5.5

VREG

Internal logic supply voltage and

regulator output

1.62

1.8

1.98

VIH

HIGH level input voltage (all digital

pins except KEY1 and KEY2)

High level

guaranteed

1.35

1.98

VIL

LOW level input voltage (all digital

pins except KEY1 and KEY2)

Low level

guaranteed

00.45

VIH

HIGH level input voltage (KEY1 and

KEY2 pins)

High level

guaranteed

35.5

VIL

LOW level input voltage (KEY1 and

KEY2 pins)

Low level

guaranteed

IIH, IIL

Input current (all pins)

VIN = VIH or VIL

-2

µA

VHYS

Hysteresis voltage (digital pins)

0.2

VOL

Low level output voltage (Digital

output pins)

IOL2 = 4 mA

0.4

IOLEAK

Driver leakage current

Drivers off

-150

µA

ISEG

Segment drive LED sink current

VLED = VF = 2.5 V

VDIGIT = VCC – 1.0

-30

-40

-50

IDIG

Digit drive LED source current

VDIGIT = VCC – 1.0

240

320

400

ITOLSEG

Segment drive current matching

VCC=5.0 V,

TA=25°C

VLED=2.5V; LED

current = 40 mA

±4.0

RSET

External current setting reference

resistor (precision =

±1% tolerance)

ISEG = 40 mA

360

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