Microchip MEC1705 Manual

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 2016 Microchip Technology Inc. DS00002295A-page 1

INTRODUCTION

The MEC170x can achieve very low power consumption. The part consumes the lowest power when the part is in heavy

sleep mode, with the 48MHz and EC processor clock turned off, in the S5 system sleep state.

There are several steps that should be taken to ensure that the part consumes the lowest power. These are outlined in

the sections that follow.

This document includes the following topics:

•Pin Considerations on page 2

•Counters/Timers/LEDs on page 2

•Miscellaneous on page 3

•Low Power Guidance on page 3

Audience

This document is written for system engineers who want to achieve a low power design using the MEC170x device.

References

The following document should be referenced when using this application note. See your Microchip representative for

availability.

• MEC170x Data Sheet

AN2295

MEC170x Achieving Low Power Consumption

Author: Tom Rubino



Microchip Technology Inc.

AN2295

DS00002295A-page 2  2016 Microchip Technology Inc.

PIN CONSIDERATIONS

Make sure that no pins are floating. Check all pins in every state (S0, S3, S5).

Inputs:

• Make sure that pins are at a proper voltage.

- Low voltage is below the max Low Input Level.

- High voltage is above the min High Input Level.

- See Section 50.0 “ELECTRICAL SPECIFICATIONS” in the data sheet.

Outputs:

• Use the lowest output current required for the external logic.

• Do not drive outputs high into unpowered chips.

• Remove or reduce any DC Loads.

- Use the weakest pull-up and pull-down resistors required.

- For example, for keyscan pins, using pre-drive mode allows use of weaker pull-up resistors (e.g., 100k

instead of 10k).

To get lowest power, do one of the following for the pins (see Note):

1. Set the pins to output PP and drive high or low.

2. Set the pins to open drain and drive low (a high is the same as a float and causes crowbar current).

3. Set the pins to open drain and drive high – this requires a pull-up resistor to the correct power rail or crowbar

current will result – see the next item.

4. Set the pin to open drain and drive high, but if the pull-up resistor is to an under voltage level – such as a 3.3V

pin to 1.8V pull-up – then the input must be turned off to avoid crowbar current (which is current flowing from the

power rail to ground within the pad).

- This is done by setting bits[3:2], POWER_GATING, in the GPIO pin control register to 11b= VTR Powered

Output Only: Input pad is disabled and output will be tristated when VTR Power Rail is off.

5. Turn off the pin (un-power the pin).

- This is done by setting bits[3:2], POWER_GATING, in the GPIO pin control register to 10b=Unpowered: The

GPIO pad is turned off completely. Both the input buffer and output buffer on the pad are disabled.

COUNTERS/TIMERS/LEDS

Whenever possible, do not enable timers that run off of the 48MHz, since they will prevent the part from going to sleep.

Use 32KHz timers instead.

The following is a list of all 32KHz timer resources:

• WDT

• Hibernation timer

• RTOS timer

• RTC

• Week timer

• Blinking/Breathing LEDs

Note: All functional pins have GPIOs associated with them to allow the configurations described above. The bit

definitions for the GPIO pin control register are shown in Section 18.10.1 “PIN CONTROL REGISTER” in

the data sheet.

- Bit 10, GPIO_OUTPUT_SELECT, determines which register is used to update the data register for GPIO

outputs. GPIO output data for this GPIO comes from bit 16, the ALTERNATE_GPIO_ DATA field of this reg-

ister; or the bit corresponding to this GPIO in the GPIO Output Register.

- Bit 9, GPIO_DIRECTION, controls the buffer direction (input or output) when the pin function is selected as a

GPIO.

- Bit 8, OUTPUT_BUFFER_TYPE, controls the mode of the output buffer (Open Drain or Push-Pull).

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	MEC1705

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