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example when the supply voltage to the module experiences a Brown-
Out (momentary dip in the supply voltage level), or a rapid power cycle
i.e. the power is switched off and then on within 1second, there is a
possibility that the module can enter an unknown state of operation.
It is strongly recommended that the application hardware onto which the
module is mounted provides a Power-On-Reset circuit with a Brown-Out
detection capability. This will guarantee that under all circumstances the
module will operate in a known state.
A device such as the Maxim MAX6382XR26D3-T would be a suitable
part to perform the reset – it has an active high push-pull output, a 2.63V
detection threshold, and an active reset period of 140ms. This
inexpensive device is available in a SC70-3 package (2.2mm x 2.4mm)
and requires no additional components to operate. The device is used to
monitor the output of the voltage regulator on the module (through pin
27), and drives the Reset line (pin13) high when the supply voltage falls
out of tolerance. The schematic below illustrates its use.
blu2i Module
Pin27
Pin13
BC02 3V3
BC02 MRESET
GND
Please note that this 3V3 is the output of
the 3V3 regulator on the blu2i Module and
should not be connected to any other
supplies on the application hardware.
GND
10K
Vcc
ResetGnd
MAX6382
1
3
2
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