SAE800

SAE800 SIEMENS | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 14

Technical content

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 1µA
• Constant current output stage (no oscillation)
• High-efficiency power stage
• Short-circuit protection
• Thermal shutdown Semiconductor Group 1 09.94 ▼ 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 tof0 = 13.2 kHz for example, the IC will issue intriple-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 insingle-tone-mode the tone e2 (derived from the fundamental frequencyf0 ;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. P-DIP-8-4 P-DSO-8-1 SAE 800 Type Ordering Code Package ▼ SAE 800 Q67000-A8339 P-DIP-8-4 ▼ SAE 800 G Q67000-A8340 P-DSO-8-1 (SMD)

(top view) Pin Definitions and Functions Functional Description(cont’d) An RC combination is needed to generate the fundamental frequency (pinROSC ,C OSC ). The volume 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. Pin Symbol Function

1 GND Ground

2 Q Output

4 L Loudness Control

6 C OSC Oscillator Capacitor

7 E2 Trigger 2 (dual tone)

8 E1 Trigger 1 (single tone)

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 followingtable shows the trigger options: Oscillator This is a precision triangle oscillator with an external time constant (R x C). Capacitor C C on pinC OSC is charged by constant current to 1 V and then discharged to 0.5 V. The constant current is obtained on pinROSC with an external resistorRR to ground. When the voltage onC OSC is building up, the logic is reset at 350 mV. This always ensures that a complete tone sequence is issued. If the oscillator pin is short-circuited to GND during operation, the sequence is repeated. Voltages on Pin C OSC 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 The following applies:ΔVC xC C =IC x T/2 withIC =VR /2RR = 1.2 V/2RR f0 = 5/8 x 1/(RR xC C ) SAE 800

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 the Triple-Tone Sequence Envelope of maximum amplitudes of three superimposed tones on Q (time scale for fOSC = 13.2 kHz) Ratio of maximum amplitudes M3 : M2 : M1 = 1 : 0.89 : 0.67 SAE 800

Digital / Analog Converter, Loudness and Junction Control The DAC converts the 4-bit words from the logic into the appropriate staircase currents with the particular tone frequency. The sum currentII drives the following current amplifier. The loudness generator produces the DAC reference currentIL for all three tones. This requires connecting an external resistor to ground. The chip temperature is monitored by the junction control. At temperatures of more then approx. 170 ˚C the stop input will switch the output current II to zero. The output current is enabled again once the chip has cooled down to approx. 150 ˚C. Current Amplifier The current amplifier with a gain of 1600 boosts the currentII from approx. 470µA maximum to approx. 750 mA maximum. The output stage consists of an NPN transistor with its emitter on power GND and collector on pin Q. The current control insures that the output stage only conducts defined currents. In conjunction with the integrated thermal shutdown, this makes the configuration shortcircuit-protected within wide limits. Because of the absence of feedback the circuit is also extremely stable and therefore uncritical in applications. Resistor RL on pin L sets the output voltage swing. This assumes that the resistive component of the loudspeaker impedanceRQ responds similarly as the resistanceRL. The output amplitude of the currentII reaches the maximumIImax ≅ 3 xVL /RL at a time t of 2.33 s (only 3 tone mode), soRL has to be scaled for this point. The following applies: IQ =IImax x B = (VS –Vsat) /RQ ≈ 0.8VS /RQ 3 x B x (VL /RL)≈ 0.8VS /RQ the result is: RL =RQ x 3 x B x (VL / 0.8VS) with: B = 1600 RL =RQ x K x (VL / 0.8VS) with: K = 4800 SAE 800

Application Hints and Application Circuit 1) Loudness Resistor (max. Load Current of 3-Tone Signal with Ensured Ratio of Amplitudes) 0.8VS /RQ ≈ (VL /RL) x K RL = (VL / 0.8VS) xRQ x K; K = 4800 Example:RQ = 8Ω ;VS = 5 V;VL = 1.2 V RL = (1.2 / 4) x 8Ω x 4800 ≈ 12 kΩ 2) Oscillator ElementsR R ,C C f= 5 / 8 x 1 / (RR xC C ) Example:f= 13.2 kHz;C C = 4.7 nF RR = 5 / (8 x 13.2 x 4.7) x 106 Ω≈ 10 kΩ The following is a typical application circuit Application Circuit SAE 800

Parameter Symbol Limit Values Unit min. max. Supply voltage VS – 0.3 24 V Input voltage at E1, E2 VE1, E2 – 5 24 V Current at output Q Current at input pins E1, E2 IQ IE1, E2 – 50 – 2 750 mA mA Current at pin ROSC Current at pin L Current at pinC OSC IR IL IC – 300 – 300 – 200 200 200 200 µA µA µA Junction temperature Tj – 50 150 ˚C Storage temperature Tstg – 50 150 ˚C Operating Range Supply voltage VS 2.8 18 V Junction temperature Tj – 25 125 ˚C Oscillator frequency atC OSC fC 100 kHz Current at pinROSC Current for test mode at pin L Current at pin L IR IR IL – 200 – 200 – 10 110 – 10 µA µA µA Input voltage at E1, E2 VE1, E2 – 4 18 V Thermal resistance junction-air (P-DIP-8-4) junction-air (P-DSO-8-1) Rth JA Rth JA 100 180 K/W K/W SAE 800

1) a13 = 20 x log (M1 / (0.67 x M3)) 2) a23 = 20 x log (M2 / (0.89 x M3)) Characteristics Tj = – 25 to 125˚C;VS = 2.8 to 18 V Parameter Symbol Limit Values Unit Test Conditionmin. typ. max. Supply Section Standby current Quiescent current; pin L open ISt IQu µA mA Output Section Peak output power (tone 3) VS = 2.8 V;RQ = 4Ω ;RL = 8.2 kΩ VS = 2.8 V;RQ = 8Ω ;RL = 18 kΩ VS = 5.0 V;RQ = 8Ω ;RL = 10 kΩ VS = 5.0 V;RQ = 16Ω ;RL = 18 kΩ VS = 12 V;RQ = 50Ω ;RL = 33 kΩ PQ PQ PQ PQ PQ 250 125 450 225 450 330 165 600 300 600 mW mW mW mW mW A Output level differences: tone 1 to 3 tone 2 to 3 a13 a23 – 1 – 1 dB dB A A 2) Biasing Section Voltage at pinROSC ;RR = 10 kΩ Voltage at pin L;RL = 10 kΩ VR VL 1.2 1.2 V V Oscillator Section Amplitude FrequencyRR = 10 kΩ ; C C = 4.7 nF Oscill. drift vs. temperature Oscill. drift vs. supply voltage Δ VC D T D V – 3 0.5 13.2 + 3 V kHz 10-4/K 10-3/K Input Section Triggering voltage at E1, E2 Triggering current at E1, E2 Noise voltage immunity at E1, E2 Triggering delay at f0 = 13.2 kHz VE1 , E2 IE1 , E2 VE1 , E2 tdT 1.6 100 0.3 V µA V ms SAE 800

Output Peak VoltageVQ versus Loudness-CurrentIL Power DissipationPv of Output Stage versus Loudness-CurrentIL Max. Output PowerPQ versus Loudness-CurrentIL Peak CurrentIQ versus Loudness-CurrentIL *) Note thatIQ = f (IL) varies between 0 and K⋅IL during tone sequence. Thereby the maximum of the power dissipation during the tone sequence is the maximum of Pv (in diagram) betweenIL = 0 and chosenIL =VL/RL. SAE 800

Output Peak VoltageVQ versus Loudness-CurrentIL Power DissipationPv of Output Stage versus Loudness-CurrentIL Max. Output PowerPQ versus Loudness-CurrentIL Peak CurrentIQ versus Loudness-CurrentIL *) Note thatIQ = f (IL) varies between 0 and K⋅IL during tone sequence. Thereby the maximum of the power dissipation during the tone sequence is the maximum of Pv (in diagram) betweenIL = 0 and chosenIL =VL/RL. SAE 800

Circuit for SAE 800 Application in Home Chime Installation Utilizing AC and DC Triggering for 1, 2 or 3 Tone Chime; Adjustable Volume PCB layout information: Because of the peak currents atV S , Q and GND the lines should be designed in a flatspread way or as star pattern.

Circuit for SAE 800 Application in Home Chime Installation for Operation without Battery

SMD = Surface Mounted Device Dimensions in mm Plastic-Package, P-DIP-8-4 (Plastic Dual In-Line Package) GPD05583 Plastic-Package, P-DSO-8-1 (SMD) (Plastic Dual Small Outline) GPS05121