MCP131X datasheet(28/44 Pages) MICROCHIP

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MCP131X/2X

DS21985A-page 28

4.2

Reset Delay Timer (tRST)

The Reset delay timer ensures that the MCP131X/2X

device will “hold” the embedded system in Reset until

the system voltage has stabilized. There are several

time out options to better meet the requirements of

different applications. These Reset delay timer time

outs are shown in Table 4-2. The Standard offering time

out is typically 200 ms.

The Reset delay timer (tRST) starts after the device volt-

age rises above the “actual” trip point (VTRIP) plus the

hysteresis (VHYS). When the Reset delay timer times

out, the Reset output pin (RST/RST) is driven inactive.

TABLE 4-2:

RESET DELAY TIMER

TIME OUTS (1)

Figure 4-15 illustrates when the Reset delay timer

(tRST) is active or inactive.

FIGURE 4-15:

Reset Power-up Timer

Waveform.

4.2.1

EFFECT OF TEMPERATURE ON

RESET POWER-UP TIMER (TRPU)

The Reset delay timer time out period (tRST)

determines how long the device remains in the Reset

condition. This time out is affected by both the device

VDD and temperature. Typical responses for different

VDD values and temperatures are shown in

Figures 2-33, 2-32 and 2-31.

Note:

While the Reset delay timer (tRST) is

active, additional system current is con-

sumed.

tRST

Units

Min

Typ

Max

1.0

1.4

2.0

140

200

280

1120

1.6

2.24

sec

↑↑

This is the mini-

mum time that the

Reset delay timer

will “hold” the

Reset pin active

after VDD rises

above

VTRIP + VHYS

This is the maxi-

mum time that the

Reset delay timer

will “hold” the

Reset pin active

after VDD rises

above

VTRIP + VHYS

Note 1:

Shaded rows are custom ordered time

outs.

VTRIP

VDD

RST

tRST

Reset Delay

Timer Inactive

Reset

Delay

Timer

Inactive

See Figures 2-12,

2-10 and 2-11

See Figures 2-15,

2-14 and 2-13

See Figures 2-12,

2-10 and 2-11

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