SIPY datasheet(8/26 Pages) PYCOM

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10.1

Current consumption by power modes/features measured at 5V

10.2

Deep sleep

Due to a couple issues with the SiPy design the module

draws more current than it should while in deep sleep.

The DC–DC switching regulator always stays in high

performance mode which is used to provide the lowest

possible output ripple when the modules is in use. In this

mode, it draws a quiescent current of 10mA. When the

regulator is put into ECO mode, the quiescent current

goes down to 10uA. Unfortunately, the pin used to control

this mode is out of the RTC domain, and therefore not

usable during deep sleep. This causes the regulator to

always stay in PWM mode, keeping its quiescent current

at 10mA. Alongside this the flash chip doesn’t enter

power down mode because the CS pin is floating during

deep sleep. This causes the flash chip to consume

around 2mA of current. Only the WiPY 2.0, LoPy 1.0 and

SiPy 1.0 are affected by these issues. To work around

this issue a “deep sleep shield” is available that attaches

to the module and allows power to be cut off from the

device. The device can then be re–enabled either on a

timer or via pin interrupt. With the deep sleep shield the

current consumption during deep sleep is between 7uA

and 10uA depending on the wake sources configured.

10.0 Power

The SiPy features an on–board voltage regulator that

takes 3.5V – 5.5V from the VIN pin and regulates it to

3.3V. It is important to only use the 3.3V as an output and

not try to feed 3.3V into this pin as this could damage the

regulator.

Table 4 – Power consumption by feature

* More details can be found in section 14.2

Mode

Min

Avg.

Max

Units

Idle (no radios)

–

37.7

–

Sigfox†

–

160

–

WiFi AP

–

101

–

WiFi client

–

111

–

Bluetooth

–

95.9

–

Deep sleep*

–

15.1

–

Deep sleep with shield

–

530

–

μA

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