Siemens SAE800, SAE800G Datasheet
Programmable
SAE 800
Single-/Dual-/Triple- Tone Gong
Preliminary Data Bipolar IC
Features
● Supply voltage range 2.8 V to 18 V
● Few external components (no electrolytic capacitor)
● 1 tone, 2 tones, 3 tones programmable
● Loudness control
● Typical standby current 1 µA
● Constant current output stage (no oscillation)
● High-efficiency power stage
● Short-circuit protection
● Thermal shutdown
P-DIP-8-4
P-DSO-8-1
Type Ordering Code Package
▼ SAE 800 Q67000-A8339 P-DIP-8-4
▼
SAE 800 G Q67000-A8340 P-DSO-8-1 (SMD)
▼ New type
Functional Description
The SAE 800 is a single-tone, dual-tone or triple-tone gong IC designed for a very wide supply
voltage range. If the oscillator is set to f0 = 13.2 kHz for example, the IC will issue in triple-tone-
mode the minor and major third e2 – C sharp – a, corresponding to 660 Hz – 550 Hz – 440 Hz, in
dual-tone-mode the minor third e2 – C sharp, and in single-tone-mode the tone e2 (derived from
the fundamental frequency f0; f1 = f0 / 20, f2 = f0 / 24, f3 = f0 / 30).
When it is not triggered, the IC is in a standby state and only draws a few µA. It comes in a compact
P-DIP-8-1 or P-DSO-8-1 (SMD) package and only requires a few external components.
Semiconductor Group 1 09.94
SAE 800 SAE 800 G
SAE 800
Pin Configuration
(top view)
Pin Definitions and Functions
Pin Symbol Function
1 GND Ground
2 Q Output
3
V
S
Supply Voltage
4 L Loudness Control
5
6
R
C
OSC
OSC
Oscillator Resistor
Oscillator Capacitor
7 E2 Trigger 2 (dual tone)
8 E1 Trigger 1 (single tone)
Functional Description (cont’d)
An RC combination is needed to generate the fundamental frequency (pin
R
, C
OSC
). The volume
OSC
can be adjusted with another resistor (pin L). The loudspeaker must be connected directly between
the output Q and the power supply VS. The current-sink principle combined with an integrated
thermal shutdown (with hysteresis) makes the IC overload-protected and shortcircuit-protected.
There are two trigger pins (E1, E2) for setting single-tone, dual-tone or triple-tone mode.
Semiconductor Group 2
SAE 800
Block Diagram
Semiconductor Group 3
SAE 800
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 E2 Mode Issued Sequence
Triggered Triggered Triple-tone Minor and major third
Grounded/open Triggered Dual-tone Minor third
Triggered Grounded/open Single-tone 1st tone of minor third
Oscillator
This is a precision triangle oscillator with an external time constant (R x C). CapacitorCC on pin C
OSC
is charged by constant current to 1 V and then discharged to 0.5 V. The constant current is obtained
on pin R
When the voltage on C
with an external resistor RR to ground.
OSC
is building up, the logic is reset at 350 mV. This always ensures that a
OSC
complete tone sequence is issued. If the oscillator pin is short-circuited to GND during operation,
the sequence is repeated.
The following applies:
Voltages on Pin C
OSC
∆V
x CC = IC x T/2 with IC = VR/2RR = 1.2 V/2R
C
f
= 5/8 x 1/(RR x CC)
0
Semiconductor Group 4
R
SAE 800
Logic
The logic unit contains the complete sequence control. The oscillator produces the power-on reset
and the clock frequency. Single-tone, dual-tone or triple-tone operation is programmed on inputs
E1 and E2. The 4-bit digital/analog converters are driven in parallel. In the event of oscillator
disturbance, and after the sequence, the dominant stop output is set. By applying current to pin L,
the sequence can be shortened by a factor of 30 for test purposes.
The following figure shows the envelope of the triple-tone sequence:
Envelope of maximum amplitudes of three
superimposed tones on Q (time scale for
f
= 13.2 kHz)
OSC
Ratio of maximum amplitudes
M3 : M2 : M1 = 1 : 0.89 : 0.67
Envelope of the Triple-Tone Sequence
Semiconductor Group 5
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