MCP48FVB08 datasheet(54/112 Pages) MICROCHIP

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MCP48FXBX4/8

DS20006362A-page 54

 2020 Microchip Technology Inc.

4.1.2

BROWN-OUT RESET

The Brown-out Reset occurs when a device has power

applied to it and that power (voltage) drops below the

specified range.

When the falling VDD voltage crosses the VPOR trip

point (BOR event), the following occurs:

• The serial interface is disabled.

• EEPROM writes are disabled.

• The device is forced into a Power-Down state

(PDnB:PDnA = 11). Analog circuitry is turned off.

• The volatile DAC register is forced to 000h.

• Volatile Configuration bits, VRnB:VRnA and Gx,

are forced to ‘0’.

If the VDD voltage decreases below the VRAM voltage,

all volatile memory may become corrupted.

As the voltage recovers above the VPOR/VBOR voltage,

see Section 4.1.1 “Power-on Reset”.

Serial commands not completed due to a brown-out

condition may cause the memory location (volatile and

nonvolatile) to become corrupted.

Figure 4-1 illustrates the conditions for power-up and

power-down events under typical conditions.

FIGURE 4-1:

POR/BOR Operation.

VPOR

VDD(MIN)

BOR,

Volatile DAC Register = 000h,

Volatile VRnB:VRnA = 00,

VRAM

Volatile Gx = 0,

Volatile PDnB:PDnA = 11

VBOR

POR Starts Reset Delay Timer;

After it Times Out, the Serial Interface

can Operate (if VDD  VDD(MIN))

TPORD

Volatile Memory Retains

Data Values

POR Forced

Active

Default Device Configuration

Latched into Volatile Configuration

Bits and DAC Register; POR

Status Bit is Set (‘1’)

Volatile Memory

becomes Corrupted

Device in

Unknown

State

Device in

Power-

Down

State

Below Min.

Operating

Voltage

Normal Operation

Device

in POR

State

Device in Unknown

State

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