Programmable Timers
SAE 0530 SAE 0531
Preliminary Data
Bipolar IC
Type
Ordering Code
Package
SAE 0530
Q67000-H8403
P-DIP-18
SAE 0531
Q67000-H8431
P-DIP- 18
SAE 0530 for 50 Hz line frequency SAE 0531 for 60 Hz line frequency With these programmable timers (at 50-Hz or 60-Hz line frequency, respectively) delay times between 1 second and 31.5 hours can be set. Among other purposes they serve for triggering triacs in an ac line. The power may be supplied either by the ac line or by a dc source. The time base is the line frequency. The versatile programmable timer covers a great variety of applications, such as electronic timers, cooking equipment control, espresso machines, hand-driers, coin changing machines and slot machines, stairwell-light time switches, industrial controls, developing systems for photographic labs, automatic starters (to preheat car engines), and operating-hours counters. Features
q Direct operation from ac line or dc supply possible q Time base is 50/60-Hz line frequency q Triac triggering with voltage synchronization for resistive loads, or with current synchronization for inductive and capacitive loads. q Trlac gate trigger current up to 150 mA q Continuous output current for relay actuation max.100 mA q Input and output delay can be retriggered. q 8 overlapping timing periods between 1 second and 31.5 hours q Extended temperature range from -25°C to +85°C
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Programmable Timers
SAE 0530 SAE 0531
Pin configuration (Top view) 0
VS
N
TS
S
T
FC
TC
A
I
B
H
C
G
R
F
D
E
Pin configuration Pin
Symbol
Function
1
O
Circuit ground
2
N
Ligne voltage via series resistor
3
S
Start
4
FC
Function changeover
5
A
Programming of basic timing unit
6
B
Programming of basic timing unit
7
C
Programming of basic timing unit
8
R
Reset
9
D
Basic timing unit × 1
10
E
Basic timing unit × 2
11
F
Basic timing unit × 4
12
G
Basic timing unit × 8
13
H
Basic timing unit × 16
14
I
Basic timing unit × 32
15
TC
Triac operation mode setting
16
T
Triac triggering
17
TS
Triac synchronization
18
VS
Positive supply voltage
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Programmable Timers
SAE 0530 SAE 0531
Block diagramm
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Programmable Timers
SAE 0530 SAE 0531
Circuit Description The clock frequency is applied to N (line voltage via series resistor). Clock Input N has a hysteresis of about 0,5 V. Through division of the line frequency into the portions 1:50 (1:60)1 ), 1:60, 1:10, and 1:3 the time basis for 8 timing periods is generated. The timing period is selected via inputs A, B and C, according to the following truth table: Timing period
A
B
C
1 2 3 4 5 6 7 8
L L L L H H H H
L L H H L L H H
L H L H L H L H
Basic timing unit 1" 3" 10'' 30'' 1' 3' 10' 30'
Max. time 1'3" 3'9" 10'30" 31'30" 1 h3' 3 h9' 10 h30' 31 h30'
L and H potentials are referred to terminal 0; e.g. L = 0, H = VS The time basis of the set period Is multiplied in the flip flops 1, 2, 4, 8, 16, 32. The flip flops are connected to the pins D, E, F, G, H, l in such a way that these get a certain value, i.e. the values 1, 2, 4, 8, 16, 32. The desired delay time at output T derives from the following formula : delay time = basic timing unit x value D...l. This time results from connecting the corresponding pins D...l to pin R. Should several of this pins D to I be connected to R, the corresponding delay times are added. Example Line frequency = 50 (60)1 ) Hz; set range 1 (basic timing unit = 1 s); D, F and I are connected to R (value 37); the resulting delay time is 37 s. Function changeover The circuit allows two operation modes which are set through pin FC (function changeover) : 1.
“momentary switching function" in acc. with DIN 46120. The triac at pin T turns on with the rising edge at the start input S and turns off when the set time has passed, independently of the start pulse length.
2.
"switch-off delay" in ace. with DIN 46120. The triac turns on with the rising edge at S. The falling edge at S starts the timing period. The triac remains in on-state until the set period has passed. Both operation modes are retriggerable during the timing period.
1
FC
Function
L H
Momentary switching function Switch-off delay
) Value in parentheses applies to 60-Hz version.
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Programmable Timers
SAE 0530 SAE 0531
To protect the start input S against external interference and contact bounce, it has a dead time of between 20 and 40 mS (1/60 to 1/30 s)1) , depending on the phase of the 50 (60)1) Hz line. To avoid positive and negative voltages the IC is equipped with an internal pull-up resistor and with clamping diodes. Reset during a timing period is accomplished by interrupting the connection to R, by applying an H potential to R or by turning VS on and off. The reset input R is equipped with a dead time of 40 mS (1/30 s)1). Application note If R is connected to one of the pins D through I via a multiposition switch, and if a reset of the timing period is to be avoided during the changeover, a suitable capacitor is required between R and 0. This applies only in cases where the interruption is greater than 40 mS (1/30 s)1). When the supply voltage Is applied the circuit is automatically reset. Whereas no timing period is started when 0 potential is applied to S, a timing period is Initiated upon applying S to VS. Triac stage Pin TS (triac synchronization) is the input of a zero voltage switch and is used to synchronize the output T (open collector) with the load voltage or the load current. With Vs VS VTS < VS
2 2 2 2 2 2 2
L input current at A,B,C,FC,R L input current at S L input current à N4) H input current at A,B,C,S,FC,R H input current ar N4) H input current at TC
IA -IIS -IN IA... IN ITC
VA... = 0 V VIS = 0 V VN = 0 V VA... = VS VN = VS 4.5 VTC VS
1 1 1 1 1 1
Pos. Switch-over current at TS Pos. Switching hysteresis at TS Neg. Switch-over current at TS Neg. Switching hysteresis at TS
ITS+ IHY+ ITSIHY-
RSyn = 0 RSyn = 0 RSyn = 0 RSyn = 0
2 2 2 2
L voltage at D,E,F,G,H,I
VD
ID... = 0.5mA
1
H reverse at D,E,F,G,H,I
ID...
L output voltage at T
VQ VQ VQ
1.1 0.8 0.4
20 20 1 20 1
1 IT = 1mA IT = 10mA IT = 100mA
1 1 1
0.7 0.8 1
0.9 4.5
1
) with impressed voltage at VS ) with impressed current at N 3 ) with impressed current at S 4 ) if N is clock input 2
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Programmable Timers
SAE 0530 SAE 0531
Pulse Diagrams of the Time operation Modes
Monentary switchi ng function
> 40ms (>1/30s)*
St art Pulse at S
Volt age at the load Set Time max. 31.5h Volt age at R/D... I
S Dead time 20 to 40 ms (1/60s t o 1/30s)*
R Dead time 40 ms (1/30s)*
* Dat a in Parentheses Applies to 60 - Hz Version Sw itch-off del ay
St art Pulse at S
> 40ms (>1/30s)*
> 40ms (>1/30s)*
Volt age at the load Set Time max. 31.5h
Volt age at R/D... I
S Dead time 20 to 40 ms (1/60s t o 1/30s)*
S Dead time 20 to 40 ms (1/60s t o 1/30s)*
R Dead time 40 ms (1/30s)*
* Dat a in Parentheses Applies to 60 - Hz Version
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Programmable Timers
SAE 0530 SAE 0531
Pulse Diagrams for triac Operation Modes 1 and 2
Operation mode 1 : Voltage synchronization with resistive loads (TC at VS) V at the load I at the load VS
VTS VS VT VS 0 Operation mode 2 : Current synchronization with non-resistive loads (Capacitance Ce at TC) V at the load I at the load VS
VTS VS t
t
VT
VS T = f(Ct ) 0
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