SX8124 Datasheet

SX8124
24 hours timer synchronized on 50/60Hz mains
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
Features
Description
The SX8124 is 24 hours timer with an analog
programmable duty cycle that synchonizes on
European standard (220V/50Hz) and US standard
(110V/60Hz) mains for high timing precision without
calibration or resonator.
The SX8124 starts counting time when connected to
the mains, its internal counter can be reset on the
press of a button (optional) or by setting the
duration to zero. The SX8124 duty cycle is set using
one single resistive divider. Its output can be forced
on or off with the press of the optional button.
24 hours timer synchronized on mains frequency
Analog period setting
Automatic 50 Hz and 60 Hz detection
Simplest usage
Manual on/off/reset option
LED status option
Applications
Mosquito repellent
Odor killers
SX8124 outputs are complementary to simplify the
connection of switches and an optional LED can
confirm the timer status.
Illuminated decoration
Xmas animation
Ordering Information
Part number
Function
Package
SX8124ISTRT
24 hours timer
SOIC-8
- Available in tape and reel only
- WEEE/RoHS compliant. Pb-Free and Halogen Free.
Functional Bloc Diagram
1.2 – 2.0 V supply
Reg
SX8124
ADC
PHASE
SYNC
START
DEBOUNCE
LED
BURST
VDD
CONTROL
DURATION
24 hours
duration
OUT
VSS
Start Timer
ON/OFF outputs
LED blink:
Once every 5 sec: off
Twice every 5 sec: on
2 Hz: ‘‘no synch’’ error
ACS - Revision 2.4
© Semtech Corp.
October 2010
Page 1
NOUT
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SX8124
24 hours timer synchronized on 50/60Hz mains
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
TABLE OF CONTENT
Section
Page
ELECTRICAL SPECIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1
2
2.1
2.2
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
4
4
4
TECHNICAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3
3.1
3.2
4
4.1
4.2
4.3
5
6
6.1
6.2
7
8
8.1
8.2
9
9.1
9.2
10
10.1
10.2
10.3
Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Digital input levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Pin states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Safe mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Low voltage mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Active mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
System architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
24h Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Operating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Debounce on START pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Setting duration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Timer synchronization on a 50Hz or 60Hz external phase. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
External phase available for synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
No phase available for synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Timer reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Reset with the START pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Reset with the DURATION pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
LED output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Synchronized on phase, outputs ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Synchronized on phase, outputs OFF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Not synchronized on phase. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
APPLICATION EXAMPLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
11
11.1
11.2
Complete application schematics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
LED boosters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Low cost LED output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
MECHANICAL SPECIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
12
12.1
12.1.1
12.1.2
12.1.3
Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SOIC-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Outline drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Land pattern. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Marking information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ACS - Revision 2.4
© Semtech Corp.
October 2010
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20
20
20
21
22
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SX8124
24 hours timer synchronized on 50/60Hz mains
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
ELECTRICAL SPECIFICATION
1
Absolute Maximum Ratings
Note
Table 1.
The Absolute Maximum Ratings, in table below, are stress ratings only. Functional
operation of the device at conditions other than those indicated in the Operating
Conditions sections of this specification is not implied.
Exposure to the absolute maximum ratings, where different to the operating
conditions, for an extended period may reduce the reliability or useful lifetime of the
product.
Absolute maximum ratings
Parameter
Symbol
Min
Max
Unit
Supply Voltage
VAMRVDD
-0.3
2.5
V
Pin Voltage (non-supply pins)
VAMRVIN
VSS - 0.3
VDD + 0.3
V
Sink or source current on any pin
IAMRISS
-100
100
mA
Storage Temp
TSTOR
-50
+150
°C
ESD conditions
ACS - Revision 2.4
© Semtech Corp.
HBM
ESDHBM
4000
V
CDM
ESDCDM
1000
V
MM
ESDMM
200
V
October 2010
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SX8124
24 hours timer synchronized on 50/60Hz mains
ADVANCED COMMUNICATIONS & SENSING
2
Specifications
2.1
Operating Conditions
Note
Table 2.
DATASHEET
Circuit operates within the Supply Voltage Range VDD-VSS = VDDOC.
The specification is verified within the Full Spec Voltage Range VDD-VSS = VDDSPEC.
Operating range
Parameter
Symbol
Min
Max
Unit
Supply Voltage Range
VDDOC
0.9
2.0
V
Full Spec Voltage Range
VDDSPEC
1.0
1.8
V
Ambient Temperature
TOC
-40
+85
°C
2.2
Circuit specification
Note
Table 3.
Conditions: Temperature within TOC and VDD-VSS within VDDSPEC, unless
otherwise stated.
Circuit electrical specification
Parameter
Symbol
Typ
Max
Unit
VSAFE
0.6
0.7
V
Threshold
VPOR
0.9
V
Hysteresis
VPORHYST
150
mV
Safe mode low limit
Min
POR voltage
Switch ON level
VON
T : 0 to 70°C
Switch OFF level
0.95
1.05
1.15
V
0.85
0.95
1.00
V
0.85
0.95
1.05
V
VOFF
T : -40 to 85°C
VDD
VON
VOFF
VPOR
VPORHYST
VSAFE
time
Mode :
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Safe
Low Batt
October 2010
ON : Active or Sleep
Page 4
Low Batt
Safe
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SX8124
24 hours timer synchronized on 50/60Hz mains
ADVANCED COMMUNICATIONS & SENSING
Table 4.
Circuit power consumption specifications
Parameter
Supply current in Timer Active mode
(outputs no loaded...
Symbol
Min
VDD=2.0V
Typ
Max
VDD=1.2V
ILV
Supply current in Safe mode
ISAFE
Unit
30
μA
19
μA
IACTIVE
Supply current in Low Voltage mode
Table 5.
DATASHEET
10
30
μA
10
μA
Max
Unit
Digital IOs specifications
Parameter
Symbol
Min
Typ
Startup time at power-on
tSTART
Output High Voltage
VOH
3/4 VDD
VDD
V
Output Low Voltage
VOL
VSS
1/4 VDD
V
0.1
s
VDD = 0.9 V
IOH09
4
mA
VDD >= 1.2 V
IOH12
10
mA
VDD = 0.9 V
IOL09
4
mA
VDD >= 1.2 V
IOL12
10
mA
Max Source Current at min VOH
Max Sink Current at max VOL
Input capacitance
Table 6.
CI
10
pF
Max
Unit
General specifications
Parameter
Symbol
Min
Typ
Time to synchronize on mains frequency
TSynch
250
ms
Minimal time of active button to reset internal counter
TReset
3
s
Pull-up resistor on START
RPULL
ACS - Revision 2.4
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30
100
kOhm
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SX8124
24 hours timer synchronized on 50/60Hz mains
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
TECHNICAL DESCRIPTION
3
Pinout
Table 7.
1.
SOIC-8 pinout
Pin#
Pin name
Pin type
Pin function
Reset
1
DURATION
Analog input
Analog input to set duty cycle.1
High impedance
2
PHASE
Digital input
Input for phase and frequency detection
High impedance
3
START
Digital input
Optional button to reset counter or switch output
pull up
4
LED
Digital output
Optional LED pulses
VSS
5
NOUT
Digital output
Output, low when active
VSS
6
VSS
Power ground
Negative supply and IC ground
Negative supply
7
OUT
Digital input
Output, high when active
VDD
8
VDD
Power positive
Positive supply
Positive supply
In active mode, input impedance on DURATION pin is 500k min, 750k typical and 1000k max.
1
8
DURATION
VDD
PHASE
OUT
START
VSS
LED
NOUT
Figure 1. SOIC-8 pinout
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SX8124
24 hours timer synchronized on 50/60Hz mains
ADVANCED COMMUNICATIONS & SENSING
3.1
DATASHEET
Digital input levels
Input thresholds levels scale with VDD. Inputs have an hysteresis based on a Schmitt trigger schematics.
VIL, VIH vs VDD
2
1.5
Threshold
VDD
1
VIH
0.5
VIL
0
0.8
1
1.2
1.4
1.6
1.8
2
VDD
Figure 2. Input level scales with VDD
3.2
Pin states
Table 8.
Pinout vs Power mode
Pin state
Pin#
Pin name
Pin type
Safe mode
Low voltage mode
Active mode
1
DURATION
Analog input
High impedance
High impedance
High impedance
2
PHASE
Digital input
High impedance
High impedance
High impedance
3
START
Digital input
High impedance
pull up
pull up
4
LED
Digital output
High impedance
VSS
43kHz burst or VSS
5
NOUT
Digital output
High impedance
VSS
VSS or VDD
6
VSS
Power ground
Negative supply
Negative supply
Negative supply
7
OUT
Digital input
High impedance
VDD
VSS or VDD
8
VDD
Power positive
Positive supply
Positive supply
Positive supply
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SX8124
24 hours timer synchronized on 50/60Hz mains
ADVANCED COMMUNICATIONS & SENSING
4
DATASHEET
Power Modes
VDD
1.05V
IOs ON
0.95V
IOs OFF
0.9V
Timer ON / OFF
Hysteresis
0.6V
LOW
VOLTAGE
Safe
ACTIVE
SAFE
LOW
VOLTAGE
SAFE
0V
time
Figure 3. Operating modes vs VDD voltage
4.1
Safe mode
The internal system goes in Safe mode as soon as the VDD voltage is above 0.6-0.7V. In this mode all pins are
set in high impedance and are inactive. This guarantees a safe start-up.
4.2
Low voltage mode
The internal 24h timer and phase detection/synchronization functions are active. All input ( BUTTON, PHASE,
DURATION ) pins functionalities remains active but will not activate the outputs.
All outputs are forced to a default static state as follows:
OUT pin is forced high
NOUT pin is forced low
LED pin is low
4.3
Active mode
The outputs are active and set according to the device internal states:
OUT and NOUT pin active (see “Operating” on page 10)
LED pin sending 250ms bursts (see “LED output” on page 15)
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SX8124
24 hours timer synchronized on 50/60Hz mains
ADVANCED COMMUNICATIONS & SENSING
5
DATASHEET
System architecture
The system is based on its internal timer to track frequency and to disciminate 50 Hz vs 60 Hz supply. If there
is no input on PHASE pin, the system timing will use the internal oscillator (10% precise).
Set
duration
ADC
DURATION
VDD
Reset ‘0’
detect
PHASE
60 Hz
detect
OUT
50 Hz
detect
24H
TIMER
RC
Oscillator
START
Debounce
LED
Output
control
Reset
3s detect
Burst gen
VSS
NOUT
Figure 4. SX8124 Architecture
Once the system is locked on the mains phase, its time precision is given by the mains frequency precision.
The period of the output signal on OUT and NOUT is 24 hours. The duty cycle on these pins is equal to the
relative voltage on pin DURATION version the voltage on pin VDD. If DURATION is 1/3 of VDD, OUT will be
high for 8 hours and down for 16 hours.
Remark that when the OUT state is manually modified using the START pin, this does not influence the
internal counter: the OUT (and NOUT) pins will continue to be switched “on” at the end of the 24 hours cycle
and “off” after the programmed duty cycle. The LED outputs is a signal indicating the internal chip status (see
10. LED output).
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SX8124
24 hours timer synchronized on 50/60Hz mains
ADVANCED COMMUNICATIONS & SENSING
6
24h Timer
6.1
Operating
DATASHEET
OUT
NOUT
toggle at set duration
24h cycle
start timer
(re)start
Next 24h cycle
Figure 5. Outputs waveforms during the 24 h cycle
The pin START is used to change the OUT (and NOUT) state. A short pulse (below 1 second) on this pin
manually changes the OUT and NOUT state (Figure 6). A long pulse (around 3 seconds or more) resets the
system and restarts the synchronization of the chip on its PHASE input.
Short low pulse
Short low pulse
START
OUT
NOUT
start timer
pin toggle
pin toggle
24h cycle
(re)start
Next 24h cycle
Figure 6. Outputs toggling pushing START pin down during less than 1 second
6.2
Debounce on START pin
The START pin is active low. For a start/stop command detection, the voltage on the START pin must be
maintained low during 10ms. Then, a delay of 20ms is necessary before the next start/stop command.
This allow to remove wrong start/stop commands due to oscillations when using of low-cost push buttons.
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SX8124
24 hours timer synchronized on 50/60Hz mains
ADVANCED COMMUNICATIONS & SENSING
7
DATASHEET
Setting duration
The measurement of DURATION pin voltage is ratiometric to VDD. The 24h duty cycle on OUT and NOUT pins
is equal to the relative voltage on pin DURATION versus the voltage on pin VDD. For example if DURATION is
1/3 of VDD, OUT will be high for 8 hours and down for 16 hours.
The voltage resolution on the DURATION pin is 256, so the OUT and NOUT pin can toggle at each step of 24H
/ 256 = 5.625 minutes.
VDD
256
DURATION
128
0
SX8124
VDD
VSS
VSS
Figure 7. 256 steps resolution on DURATION pin
OUT
NOUT
toggle at set duration
24h cycle
start timer
Step 0
Step 128
(re)start
Next 24h cycle
Step 256
Figure 8. 256 steps on the 24H timer cycle
Steps 0 to 2 on the DURATION pin are reserved for detection of a Reset command with the pin set to ground.
The timer can not be set to toggle OUT and NOUT during the 15 first minutes after the start of the 24H cycle.
See “Reset with the DURATION pin” on page 14 .
While the duration is set to ‘0’, the LED pin is not active and set to VSS.
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SX8124
24 hours timer synchronized on 50/60Hz mains
ADVANCED COMMUNICATIONS & SENSING
8
DATASHEET
Timer synchronization on a 50Hz or 60Hz external phase
To avoid timing drifts over the time, the SX8124 can be synchronised on a signal from the mains.
The SX8124 permanently checks the duration between two consecutive edges on the PHASE pin.
8.1
External phase available for synchronization
If OUT and NOUT are on :
60 Hz
detect
50 Hz
signal
Burst gen
50 Hz
detect
PHASE
24H
TIMER
RC
Oscillator
LED
If OUT and NOUT are off :
Output
control
Figure 9. Example: timer synchronized on a 50Hz phase
Please note that for correct phase detection the edges on the PHASE pin must be sharp . A sinus or triangular
wave is not recommended.
8.2
No phase available for synchronization
If there is no clean 50Hz or 60Hz signal on PHASE pin, the system timing switch on the internal RC oscillator. In
this case the timer will be 10% precise. The LED output is sending 2Hz burst to indicate that the timer is not
synchronized and counting based on the internal base time.
60 Hz
detect
No signal
or noise
Burst gen
50 Hz
detect
PHASE
24H
TIMER
RC
Oscillator
LED
Output
control
Figure 10. Timer not synchronized on an external phase
The maximum frequency on PHASE pin should not exceed 20kHz. If the signal on this pin has a frequency
potentially higher than 20kHz it must be low pass filtered with a capacitor.
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SX8124
24 hours timer synchronized on 50/60Hz mains
ADVANCED COMMUNICATIONS & SENSING
9
Timer reset
9.1
Reset with the START pin
DATASHEET
A button can be connected between the BUTTON pin and VSS. Holding START down during 3 seconds or
more resets the 24 hours timer and the system.
Pressing shortly the button changes the output state without modifying the internal counter.
SX8124
VDD
> 3 seconds
START
VSS
Figure 11. Timer reset with the START button
Long pulse
Long pulse
START
OUT
NOUT
start timer
(re)start timer
(re)start
Toggle at set duration
24h cycle
Figure 12. Manual reset holding START pin down during 3 seconds or more
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SX8124
24 hours timer synchronized on 50/60Hz mains
ADVANCED COMMUNICATIONS & SENSING
9.2
DATASHEET
Reset with the DURATION pin
Moving the DURATION voltage to 0V and then moving it back to the desired duration will reset the 24 hours
timer. This can be done either with a switch in parallel with the DURATION resistive divider or if this divider is
made with a potentiometer by turning this potentiometer to 0 leaving it there for a few seconds and then
bring it back to the desired position.
12h
DURATION
6h
SX8124
VDD
18h
VSS
0h 24h
Figure 13. Timer reset by pushing DURATION pin to ground
DURATION
OUT
NOUT
reset start
(re)start
toggle at set duration
24h cycle
Figure 14. Manual reset moving DURATION pin voltage down to 0V
The voltage on DURATION pin remains ratiometric to VDD while VDD is below 1.8V.
Additionally, if the voltage on DURATION pin exceeds |1.8V| the timer is reinitialized.
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10
DATASHEET
LED output
The LED output is used to indicate the status of the internal system. The LED signal is made of bursts of 4 us
pulses with a period of 30 us and total duration of 250 ms. This makes possible to activate a LED even at very
low voltage.
To indicate that OUT is high, the LED sends two bursts separated by 500 ms every 5 seconds.
To indicate that OUT is low, the LED send one burst every 5 seconds.
To indicate that the system is not synchronized (no PHASE detected, or frequency measured on PHASE
outside 50-60 Hz, at start-up or after a manual reset), the LED continuously sends bursts separated by 250
ms.
10.1
Synchronized on phase, outputs ON
When synchronized, the LED indicates the OUT pin status. The first pulse occurs 5 seconds after a POR, timer
startup or timer reset,
OUT
NOUT
LED
250ms
500ms
250ms
5s
250ms
250ms
500ms
Figure 15. Dual pulse
10.2
Synchronized on phase, outputs OFF
The first pulse occurs 5 seconds after a POR, timer startup or timer reset,
OUT
NOUT
LED
250ms
5s
250ms
5s
Figure 16. Single pulse
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24 hours timer synchronized on 50/60Hz mains
ADVANCED COMMUNICATIONS & SENSING
10.3
DATASHEET
Not synchronized on phase
OUT
NOUT
LED
250ms 250ms
Figure 17. Continuous pulses
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24 hours timer synchronized on 50/60Hz mains
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
APPLICATION EXAMPLES
11
Complete application schematics
200 V supply
91 kOhm
200V
91 kOhm
200V
1.5 – 2.0 V supply
15 kOhm
11 W Heater
1.2 V
1.5 mA
50 kOhm
150 uF
0Ohms
25 mA
SX8124
DURATION
ADC
VDD
1 kOhm
PHASE
SYNC
START
DEBOUNCE
LED
BURST GEN
CONTROL
51 kOhm
50 uA
27 nF
3.9 MOhm
OUT
500 uA
VSS
MSPA44
W < 300 mW
IC < 300 mA
B = 50
VC < 300 V
VB < 6V
NOUT
Figure 18. Application schematics with low-power sleep mode (below 0.3 W)
The circuit can be directly powered from the mains through a diode bridge and a resistor as long as the
supply voltage is limited at ~1.2V by diodes or similar devices. The choice of the resistor that limits the supply
current must be made so that it delivers enough current for the system to supply the IC and any other device
that is connected to that supply, but the resistor must be large enough to limit the current in sleep mode (120
kOhm will limit power dissipation below 0.3W on a 220V network).
The RC filter on the power supply is there to reject 100 Hz or 120 Hz variations.
The phase detector is used to increase the precision on the 24 hours counter. It is recommended to protect
the pin with external diodes. The filter on the phase detector is there to reject high frequency perturbations
(several kHz) but must let the 50 Hz or 60 Hz go through with limited attenuation.
The timer element is a potentiometer. The total resitivity of the potentiometer must be low enough to avoid
sensitivity to the DURATION pin impedance (> 500 kOhm) and high enough to limit current drift current. The
voltage applied on the potentiometer is 1/100 of the voltage applied on the resistor that protects the supply
voltage of the chip, therefore the current through these resistors will be in the same ratio if they have the
same value.
The power element (either a resistove heater for a diffuser or a motor for a ventilator) will be controlled
through an NPN transistor.
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24 hours timer synchronized on 50/60Hz mains
ADVANCED COMMUNICATIONS & SENSING
11.1
DATASHEET
LED boosters
The chip sends bursts to trigger the LED. If the LED is supplied by the regulated voltage VDD it is expected to
be connected to a transistor and in parallel with a coil to get enough voltage to light.
0.9 – 2.0 V
Coil
LED
SX8124
VDD
VSS
LED
Figure 19. Booster for red LED
0.9 – 2.0 V
Coil
SX8124
VDD
VSS
LED
LED
Figure 20. Booster for white/blue LED
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24 hours timer synchronized on 50/60Hz mains
ADVANCED COMMUNICATIONS & SENSING
11.2
DATASHEET
Low cost LED output
The schematic on Figure 21 below shows a LED driving without the usage of a coil to drive the LED, and also
reduce the costs of the BOM. The Rlim, Rb resistors and the transistor hfe must be carefully choosed
according to the LED and mains voltage.
100V or 200V
0.9 – 2.0 V
Mains
Rlim
SX8124
VDD
LED
VSS
Rb
LED
Figure 21. LED supplied by the mains
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24 hours timer synchronized on 50/60Hz mains
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
MECHANICAL SPECIFICATION
12
Packages
12.1
SOIC-8
12.1.1 Outline drawing
DIMENSIONS
MILLIMETERS
INCHES
DIM
MIN NOM MAX MIN NOM MAX
A
D
e
2X E/2
E1 E
1
2
ccc C
2X N/2 TIPS
.053
.069
.004
.010
.049
.065
.020
.012
.010
.007
.189 .193 .197
.150 .154 .157
.236 BSC
.050 BSC
.010
.020
.016 .028 .041
(.041)
8
0°
8°
.004
.010
.008
A
A1
A2
b
c
D
E1
E
e
h
L
L1
N
01
aaa
bbb
ccc
N
e/2
B
D
1.75
1.35
0.25
0.10
1.65
1.25
0.31
0.51
0.25
0.17
4.80 4.90 5.00
3.80 3.90 4.00
6.00 BSC
1.27 BSC
0.25
0.50
0.40 0.72 1.04
(1.04)
8
0°
8°
0.10
0.25
0.20
aaa C
h
A2 A
SEATING
PLANE
C
h
A1
bxN
bbb
H
C A-B D
c
GAGE
PLANE
0.25
SEE DETAIL
L
(L1)
A
DETAIL
SIDE VIEW
01
A
NOTES:
1.
CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS
OR GATE BURRS.
4. REFERENCE JEDEC STD MS-012, VARIATION AA.
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DATASHEET
12.1.2 Land pattern
This land pattern is for reference purposes only. Consult your manufacturing group to ensure your company’s
manufacturing guidelines are met.
X
DIM
(C)
G
Z
Y
C
G
P
X
Y
Z
DIMENSIONS
INCHES
MILLIMETERS
(.205)
.118
.050
.024
.087
.291
(5.20)
3.00
1.27
0.60
2.20
7.40
P
NOTES:
1.
THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY.
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.
2. REFERENCE IPC-SM-782A, RLP NO. 300A.
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24 hours timer synchronized on 50/60Hz mains
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
12.1.3 Marking information
"#$
&&''
!"#$%
&&''"
!()(*%
+ !,)()%
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24 hours timer synchronized on 50/60Hz mains
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DATASHEET
© Semtech 2010
All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright
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consequence of its use. Publication thereof does not convey nor imply any license under patent or other industrial or
intellectual property rights. Semtech assumes no responsibility or liability whatsoever for any failure or unexpected
operation resulting from misuse, neglect improper installation, repair or improper handling or unusual physical or
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operation outside the specified range.
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Notice: All referenced brands, product names, service names and trademarks are the property of their respective
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E-mail: [email protected] or [email protected]
Internet: http://www.semtech.com
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EUROPE
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