ST7538Q datasheet(13/44 Pages) STMICROELECTRONICS

13 / 44 page

ST7538Q

Electrical characteristics

13/44

5V voltage regulator

VDC

Linear regulator output

voltage

0 < Io < 50mA

7.5V < PAVcc < 12.5V

-5%

5.05

+5%

PGVDC

Power Good Output

Voltage Threshold on VDC

4.3

4.5

4.7

VDC

(HYS)

PG on VDC pin Hysteresis

250

3.3V voltage regulator

DVdd

Linear Regulator Output

Voltage

0 < Io < 50mA

7.5V < PAVcc < 12.5V

-5%

3.3

+5%

PGDVdd

Power Good Output

Voltage Threshold on DVdd

3.125

DVdd

(HYS)

PG on DVdd pin Hysteresis

250

Other functions

TRSTO

Reset Time

See Figure 21;

Xtal = 16MHz

TWD

Watch-dog Pulse Width

See Figure 21

3.5

TWM

Watch-dog Pulse Period

See Figure 21

TWD +

3.5

1490

TWO

Watch-dog Time Out

See Figure 21

1.5

TOUT

TX TIME OUT

Control Register Bit 7

and Bit 8

See Figure 20

TOFF

Time Out OFF Time

See Figure 20

125

TOFFD

RxTx 0->1 vs. TOUT Delay See Figure 20

µs

TCD

Carrier Detection Time

selectable by register

Control Register

bit 9 and bit10

Figure 11

500

µs

TDCD

CD_PD Propagation Delay Figure 11

300

500

µs

MCLK

Master Clock Output

Selectable by register

Control Register

bit 15 and bit 16

see Table 11

fclock

fclock/2

fclock/4

off

MHz

BAUD

Baud rate

Control Register

bit 3 and bit 4

see Table 11

600

1200

2400

4800

Baud

Table 4. Electrical characteristics (continued)

(AVdd = DVdd = +5V, PAVcc =+9 V, PAVss, SGND = DVss = 0V, -40°C

≤TA ≤ 85°C, TJ < 125 °C, fc = 86kHz,

other control register parameters as default value, unless otherwise specified)

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

ST7538Q 数据表(PDF) 13 Page - STMicroelectronics

ST7538Q 数据表(HTML) 13 Page - STMicroelectronics

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ST7538Q 数据表(PDF) 13 Page - STMicroelectronics

ST7538Q 数据表(HTML) 13 Page - STMicroelectronics

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