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Update IO_VL53L0X.h

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Configure XSHUT control so that the pull-up on the module raises the pin to +2.8V rather than trying to drive it to +5V.
This commit is contained in:
Neil McKechnie 2023-02-22 21:08:09 +00:00
parent 4deb323802
commit c3675367ed
1 changed files with 8 additions and 6 deletions
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14
IO_VL53L0X.h
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@ -177,16 +177,18 @@ protected:
break; break;
case STATE_RESTARTMODULE: case STATE_RESTARTMODULE:
// On second entry, set XSHUT pin high to allow this module to restart. // On second entry, set XSHUT pin high to allow this module to restart.
// On some modules, there is a diode in series with the XSHUT pin to // I've observed that the device tends to randomly reset if the XSHUT
// protect the low-voltage pin against +5V, but we can provide additional // pin is set high from a 5V arduino, even through a pullup resistor.
// protection by enabling the pull-up resistor on the microcontroller // Assume that there will be a pull-up on the XSHUT pin to +2.8V as
// instead of driving the output directly. // recommended in the device datasheet. Then we only need to
// turn our output pin high-impedence (by making it an input) and the
// on-board pullup will do its job.
// Ensure XSHUT is set for only one module at a time by using a // Ensure XSHUT is set for only one module at a time by using a
// shared flag accessible to all device instances. // shared flag accessible to all device instances.
if (!_addressConfigInProgress) { if (!_addressConfigInProgress) {
_addressConfigInProgress = true; _addressConfigInProgress = true;
// Set XSHUT pin (if connected) to bring the module out of sleep mode. // Configure XSHUT pin (if connected) to bring the module out of sleep mode.
if (_xshutPin != VPIN_NONE) IODevice::configureInput(_xshutPin, true); if (_xshutPin != VPIN_NONE) IODevice::configureInput(_xshutPin, false);
// Allow the module time to restart // Allow the module time to restart
delayUntil(currentMicros+10000); delayUntil(currentMicros+10000);
_nextState = STATE_CONFIGUREADDRESS; _nextState = STATE_CONFIGUREADDRESS;