External Crystal Oscillator Circuit

No. 4263-6/11

LB1823

impedance ratio = 1:5 or greater must be used.

Xtal (MHz)

C1(pF)

C2(pF)

R(

Ω)

3 to 4

39

120

390

4 to 5

39

120

560

5 to 7

39

82

820

7 to 10

39

68

2200

Xtal (MHz)

C1(pF)

C2(pF)

R(

Ω)

3 to 4

39

180

330

4 to 5

39

150

390

5 to 7

39

100

560

7 to 10

39

68

1200

Pin Functions

Pin No.

Symbol

Function

30, 29

Hall input pin

28, 27

Hall input pin

26, 25

Hall input pin

19

UH

Output pin, constant current source output

21

VH

Output pin, constant current source output

23

WH

Output pin, constant current source output

18

UL

Output pin, open collector sink output

20

VL

Output pin, open collector sink output

22

WL

Output pin, open collector sink output

17

Power supply

16

7 V shunt regulator output

24

GND

Ground

4

CR

PWM oscillator frequency setting

9

Integrator input

10

Integrator output (speed control pin)

7

Speed discriminator output. High on overspeed.

6

PLL output

8

LD

Lock detector

Low when the motor speed is in the lock range (±6.25%)

11

12

FG pulse input

13

FG amplifier output

14

FG amplifier output (following the Schmitt circuit)

5

X’tal

Crystal oscillator. Connect a crystal oscillator element to this pin.

15

RF

Output current detection

1

S/S

Start/stop control pin

Low for start, high or open for stop

2

F/R

Forward/reverse control

Low or open for forward, high for reverse

3

BR

Brake, short brake

Low or open for start, high for brake. The S/S pin must be set to the stop state when releasing the brake.