mm1192 Mitsumi Electronics, Corp., mm1192 Datasheet - Page 3

• Manufacturer Part Number: mm1192
• Description: Hbs-compatible Driver And Receiver
• Manufacturer: Mitsumi Electronics, Corp.

MITSUMI
Circuit Diagram
Measuring Circuit
Note 1: The peripheral components in the block diagram are the constants for Ftransmit=10kHz. If the
Note 2: A block diagram is shown for an example application in which an external transistor is used; but
1. No external transistor
*
This prevents abnormal operation of internal circuits within the range 0 – -6V when negative voltage is
impressed on pins 7, 8, 9 and10. However, thyristor operation may start when negative voltage over -
6V is impressed, so we recommend an external clamp diode.
frequency is low, larger values should be chosen for the coupling capacitors between the receive and
transmit pins and the bus line and for the capacitor connecting pins 3 and 4.
depending on system conditions the internal transistor may be used, and no external transistor is
needed. In such cases pins 7 and 8 are left open, a 1Ω resistance is inserted between pins 10 and 12,
and a 1Ω resistance is inserted between pins 9 and 14.
When the load resistance (36Ω) is to be varied during use, these resistances (1Ω) should be changed
according to the load resistance. If these resistances are omitted, oscillation may occur at low
temperature.
HBS-Compatible Driver and Receiver MM1192