MCP2030 datasheet(32/66 Pages) MICROCHIP

32 / 66 page

MCP2030

DS21981A-page 32

5.7

Fixed Gain Amplifiers 1 and 2

FGA1 and FGA2 provides a maximum two-stage gain

of 40 dB.

5.8

Auto-Channel Selection

The auto-channel selection feature is enabled if the

Auto-Channel Select bit AUTOCHSEL<8> in Configu-

ration Register 5 (Register 5-6) is set, and disabled if

the bit is cleared. When this feature is active (i.e.,

AUTOCHSE <8> = 1), the control circuit checks the

demodulator output of each input channel immediately

after the AGC settling time (TSTAB). If the output is high,

it allows this channel to pass data, otherwise it is

blocked.

The status of this operation is monitored by STATUS

the current status of the channel selection activity, and

automatically updates for every Soft Reset period. The

auto-channel selection function resets after each Soft

Reset (or after Inactivity timer time-out). Therefore, the

blocked channels are re-enabled after Soft Reset.

This feature can make the output signal cleaner by

blocking any channel that was not high at the end of

TAGC. This function works only for demodulated data

output, and is not applied for carrier clock or RSSI

output.

5.9

Carrier Clock Detector

The Carrier Clock Detector senses the input carrier

cycles. The output of the detector switches digitally at

the signal carrier frequency. Carrier clock output is

available when the output is selected by the DATOUT

bit in Configuration Register 1 (Register 5-2).

5.10

Demodulator

The Demodulator consists of a full-wave rectifier, low

pass filter, peak detector and Data Slicer that detects

the envelope of the input signal.

5.11

Data Slicer

The Data Slicer consists of a reference generator and

comparator. The Data Slicer compares the input with

the reference voltage. The reference voltage comes

from the minimum modulation depth requirement

setting and input peak voltage. The data from all 3

channels are OR’d together and sent to the output

enable filter.

5.12

Output Enable Filter

The Output Enable Filter enables the LFDATA output

once the incoming signal meets the wake-up sequence

requirements

(see

Section 5.15

“Configurable

Output Enable Filter”).

5.13

Received Signal Strength

Indicator (RSSI)

The RSSI provides a current which is proportional to

the

input

signal

amplitude

(see

Section 5.30.3

“Received

Signal

Strength

Indicator

(RSSI)

Output”).

5.14

Analog Front-End Timers

The device has an internal 32 kHz RC oscillator. The

oscillator is used in several timers:

• Inactivity timer

• Alarm timer

•Pulse width timer

• Period timer

• AGC settling timer

5.14.1

RC OSCILLATOR

The RC oscillator generates a 32 kHz internal clock.

Note:

The user cannot control the gain of these

two amplifiers.

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