SX812X SEMTECH [Semtech Corporation], SX812X Datasheet - Page 9

• Manufacturer Part Number: SX812X
• Description: 1V Motor/LED control timer ADVANCED COMMUNICATIONS & SENSING
• Manufacturer: SEMTECH [Semtech Corporation]

ACS - Revision 2.2
© Semtech Corp.
4.3
4.4
4.5
ADVANCED COMMUNICATIONS & SENSING
Digital input levels
Input thresholds levels scale with VDD. Inputs have an hysteresis based on a Schmitt trigger schematics.
Debounce on BUTTON pin
The BUTTON pin is active low. For a start/stop command detection, the voltage on the BUTTON 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.
NiMH pin
Pin NIMH goes high when VDD is below the NIMH threshold of 1.41V and low when VDD is above the same
threshold.
A 30mV hysteresis allow to remove NiMH pin oscillation when the VDD voltage is near the threshold.
The supply voltage on VDD pin is checked at a 1Hz rate, so the NiMH pin can switch with a delay of 1 seconds
max.
Threshold
1.5
0.5
2
1
0
August 2010
0.8
VDD
VIH
VIL
1
Figure 3. Input level scales with VDD
1.2
Page 9
VIL, VIH vs VDD
VDD
1.4
1.6
1.8
1V Motor/LED control timer
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2
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DATASHEET