MCP2035T-ISLASHST datasheet(35/68 Pages) MICROCHIP

35 / 68 page

 2012 Microchip Technology Inc.

DS22304A-page 35

MCP2035

5.13.4

PULSE WIDTH TIMER

The Pulse Width Timer is used to verify that the

received output enable sequence meets both the

minimum TOEH and minimum TOEL requirements.

5.13.5

PERIOD TIMER

The Period Timer is used to verify that the received

output enable sequence meets the maximum TOET

requirement.

5.13.6

AGC INITIALIZATION TIMER (TAGC)

This timer is used to keep the output enable filter in

Reset while the AGC settles on the input signal. The

time-out period is approximately 3.5 ms. At the end of

this time (TAGC), the input should remain high (TPAGC),

otherwise the counting is aborted and a Soft Reset is

issued. See Figure 5-4 for details.

FIGURE 5-1:

Functional Block Diagram.

Note 1:

The device needs a continuous and

uninterrupted high input signal during

AGC initialization time (TAGC). Any

absence of signal during this time may

reset the timer and a new input signal is

needed for AGC settling time, or may

result in an improper AGC gain setting,

which will produce invalid output.

The rest of the device section wakes

up if the input channel receives a sig-

nal with the AGC settling time cor-

rectly. STATUS Register 7 bit <2>

(Register 5-8) indicates the status if the

input channel wakes up.

Configuration

To Tuning Cap X

To Modulation

VSST

LCX

Transistors

Registers

VDDT

To Sensitivity X

AGC Preserve

Detector

LFDATA/

SCLK/ALERT

External MCU

Command Decoder/Controller

Mod

Tune X

Output Enable

Lim

32 kHZ

Oscillator

AGC

Sensitivity

Control X

Filter

AGC

Timer

RSSI

CCLK/SDIO

÷ 64

Watchdog

WAKEX

LCCOM

Modulation Depth

LCY (Note 1)

LCZ

(Note 1)

Note 1: LCY and LCZ pads are internally grounded.

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