PIC10F220ESLASHP datasheet(42/86 Pages) MICROCHIP

42 / 86 page

PIC10F220/222

DS41270E-page 40

8.8

Reset on Brown-out

A Brown-out is a condition where device power (VDD)

dips below its minimum value, but not to zero, and then

recovers. The device should be reset in the event of a

Brown-out.

To reset PIC10F220/222 devices when a Brown-out

occurs, external Brown-out protection circuits may be

built, as shown in Figure 8-7 and Figure 8-8.

FIGURE 8-7:

BROWN-OUT

PROTECTION CIRCUIT 1

FIGURE 8-8:

BROWN-OUT

PROTECTION CIRCUIT 2

FIGURE 8-9:

BROWN-OUT

PROTECTION CIRCUIT 3

8.9

Power-down Mode (Sleep)

A device may be powered down (Sleep) and later

powered up (wake-up from Sleep).

8.9.1

SLEEP

The Power-Down mode is entered by executing a

SLEEP

instruction.

If enabled, the Watchdog Timer will be cleared but

keeps running, the TO bit (STATUS<4>) is set, the PD

bit (STATUS<3>) is cleared and the oscillator driver is

turned off. The I/O ports maintain the status they had

before the SLEEP instruction was executed (driving

high, driving low or high-impedance).

For lowest current consumption while powered down,

the T0CKI input should be at VDD or VSS and the GP3/

MCLR/VPP pin must be at a logic high level if MCLR is

enabled.

Note

This circuit will activate Reset when VDD goes

below Vz + 0.7V (where Vz = Zener voltage).

Pin must be configured as MCLR.

33k

10k

40k(1)

VDD

MCLR(2)

PIC10F22X

VDD

Note

This brown-out circuit is less expensive,

although less accurate. Transistor Q1 turns

off when VDD is below a certain level such

that:

Pin must be configured as MCLR.

VDD •

R1 + R2

= 0.7V

40k(1)

VDD

MCLR(2)

PIC10F22X

VDD

Note:

A Reset generated by a WDT time-out

does not drive the MCLR pin low.

Note 1:

This Brown-out Protection circuit employs

Microchip Technology’s MCP809 micro-

controller supervisor. There are 7 different

trip point selections to accommodate 5V to

3V systems.

Pin must be configured as MCLR.

MCLR

(2)

PIC10F22X

VDD

VSS

RST

MCP809

VDD

Bypass

Capacitor

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