Continued from preceding page.
Pin No.
Pin
LB1821M
Functions
Brake control (short braking operation)
Low: 0 to 1.5 V
6
BR
High: 4.0 V to VCC
An open state functions as a high-level input.
Low for start, high or open for brake mode operation.
The hysteresis is about 0.45 V.
Forward/reverse control
Low: 0 to 1.5 V
7
F/R
High: 4.0 V to VCC
An open state functions as a high-level input.
Low for forward, high or open for reverse rotation.
The hysteresis is about 0.45 V.
External clock signal input
Low: 0 to 1.5 V
8
CLK
High: 4.0 V to VCC
An open state functions as a high-level input.
The hysteresis is about 0.45 V.
f = 10 kHz, maximum
Start/stop control
Low: 0 to 1.5 V
9
S/S
High: 4.0 V to VREG
An open state functions as a high-level input.
Low for start, high or open for stop mode operation.
The hysteresis is about 0.45 V.
Speed discriminator count switching
Low: 0 to 1.5 V
10
N1
High: 4.0 V to VCC
An open state functions as a high-level input.
The hysteresis is about 0.45 V.
Equivalent circuit
Continued on next page.
No. 5686-12/16