SAE800_05 SIEMENS [Siemens Semiconductor Group], SAE800_05 Datasheet - Page 4

• Manufacturer Part Number: SAE800_05
• Description: Programmable Single-/Dual-/Triple- Tone Gong
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Circuit Description
Trigger
Positive pulses on inputs E1 and/or E2 trigger the IC. The hold feedback in the logic has a delay of
several milliseconds. After this delay has elapsed, the tone sequence is started. This prevents
parasitic spikes from producing any effect on the trigger pins.
The following table shows the trigger options:
E1
Triggered
Grounded/open
Triggered
Oscillator
This is a precision triangle oscillator with an external time constant (R x C). Capacitor
is charged by constant current to 1 V and then discharged to 0.5 V. The constant current is obtained
on pin
When the voltage on
complete tone sequence is issued. If the oscillator pin is short-circuited to GND during operation,
the sequence is repeated.
Voltages on Pin
Semiconductor Group
The following applies:
R
OSC
with an external resistor
C
OSC
C
E2
Triggered
Triggered
Grounded/open
OSC
f
0
V
= 5/8 x 1/(
is building up, the logic is reset at 350 mV. This always ensures that a
C
x
C
C
=
I
R
R
C
R
R
x T/2 with
x
to ground.
C
C
)
Mode
Triple-tone
Dual-tone
Single-tone
4
I
C
=
V
R
/2
R
R
= 1.2 V/2
Issued Sequence
Minor and major third
Minor third
1st tone of minor third
R
R
C
C
SAE 800
on pin
C
OSC