SX8124ISTRT SEMTECH [Semtech Corporation], SX8124ISTRT Datasheet - Page 11

• Manufacturer Part Number: SX8124ISTRT
• Description: 24 hours timer synchronized on 50/60Hz mains
• Manufacturer: SEMTECH [Semtech Corporation]

ACS - Revision 2.4
© Semtech Corp.
7
ADVANCED COMMUNICATIONS & SENSING
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.
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
While the duration is set to ‘0’ , the LED pin is not active and set to VSS.
NOUT
“Reset with the DURATION pin” on page 14
OUT
start timer
Step 0
October 2010
256
128
0
Figure 7. 256 steps resolution on DURATION pin
Figure 8. 256 steps on the 24H timer cycle
toggle at set duration
VDD
VSS
Step 128
24h cycle
Page 11
DURATION
24 hours timer synchronized on 50/60Hz mains
.
SX8124
VDD
VSS
Step 256
(re)start
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Next 24h cycle
SX8124
DATASHEET