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TPL5100 데이터시트(PDF) 9 Page - Texas Instruments

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부품명 TPL5100
상세설명  TPL5100 Nano Power Programmable Timer with MOS driver
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TCAL
DONE
MOS_DRV
INT. OSC.
PGOOD
A
B
C
D
TPL5100
www.ti.com
SNAS629B – JULY 2013 – REVISED AUGUST 2013
Figure 5. Timing MOS_DRV, TCAL
Supervisor Feature
A critical event that can corrupt the memory of a µC is a voltage supply drop (supply lower than minimum
operating range), and a reset of the µC is mandatory if this occurs. Since the TPL5100 is the right choice in
systems which stay most of the time in deep sleep or completely OFF, due to its ultra low power consumption, it
is fundamental that it takes into account the voltage drop events. The TPL5100 implements the supervisor
feature when working with some power management ICs, which indicate the status of the supply voltage with a
power good or battery good output. The supervisory functionality is enabled by simply connecting the Battery
management power good output to the TPL5100 PGOOD pin. If this feature is not used connect the PGOOD pin
to VDD.
In case the power management IC detects a voltage drop while the µC is OFF, consequently lowering the
PGOOD line, the TPL5100 resets its internal counter and does not allow the micro to turn ON until the PGOOD
is high again. This series of events allows the µC to avoid working in an unsafe voltage supply condition. If the
PGOOD signal is lowered while the µC is ON, the TPL51000 turns the µC OFF. The micro will be turned ON
when PGOOD is high again and the selected delay is elapsed.
Calibration Pulse
The TPL5100 is based on an ultra-low power oscillator, which has a relatively low frequency and low accuracy;
however, it shows very good cycle to cycle repeatability and very low temperature drift. In most of the
applications, the accuracy of the oscillator is enough, but if a more accurate measure of the delay period is
required, it is possible to measure the base period of the internal oscillator. A single pulse, which has the same
duration as the base period of the internal oscillator, is present at the TCAL pin of the TPL5100. This pulse starts
after a half period of the internal oscillator, from the falling edge of the MOS_DRV pulse.
A µC connected to the TPL5100 can routinely measure the width of the TCAL pulse, using a counter and an
external crystal. Once the base period of the TPL5100 is measured, the actual time delay is calculated by
multiplying the measured period by a factor, N (see Table 1), dependent upon the nominal selected time delay.
The resolution and the accuracy of the measurement depend upon the external crystal. Since the frequency of
the internal oscillator of the TPL5100 is very stable, the measurement of the calibration pulse is suggested only
when a high gradient of ambient temperature is observed. The measurement of the TCAL pulse is useful in
battery-powered applications that implement a precise battery life counter in the µC.
Copyright © 2013, Texas Instruments Incorporated
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