MCP2030A datasheet(49/74 Pages) MICROCHIP

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2011 Microchip Technology Inc.

DS22235B-page 49

MCP2030A

Related Configuration Register Bits:

• Configuration Register 1 (Register 5-2),

DATOUT<8:7>:

bit 8 bit 7

: Demodulated Output

: Carrier Clock Output

: RSSI Output

• Configuration Register 2 (Register 5-3),

RSSIFET<8>:

: Pull-Down MOSFET off

: Pull-Down MOSFET on.

• Configuration Register 0 (Register 5-1): all bits

are affected.

5.30.3.1

ANALOG-TO-DIGITAL DATA

CONVERSION OF RSSI SIGNAL

The RSSI output is an a nalog current. It needs an

external analog-to-digital (ADC) data conversion

device for digitized output. The ADC data conversion

can be accomplished by using a stand-alone external

ADC device, an external MCU that has internal ADC

features, or an external MCU that has no ADC features

but instead uses firmware. The RSSIFET is used to dis-

charge any external charge on the LFDATA pin in the

RSSI Output mode. The MOSFET can be turned on or

off with bit RSSIFET<8> of C onfiguration Register 2

(Register 5-3). When it is turned on, the internal MOS-

FET provides a discharge path for the external capaci-

tor that is connected at the LFDATA pin. This MOSFET

option is valid only if RSSI output is selected and not

controllable by users for demodulated or carrier clock

output options.

See separate application notes for various external

ADC implementation methods for this device.

See Figure 5-8 for RSSI output path.

FIGURE 5-8:

RSSI Output Path.

Note:

The pull-down MOSFET option is valid

only when the RSSI output is selected.

The MOSFET is not controllable by users

when demodulated or carrier clock output

option is selected.

RSSI Output Current

Generator

VDD

RSSI Pull-down MOSFET (controlled by Config. 2, bit 8)

Current Output

LFDATA/CCLK Pin

RSSIFET(1)

Off

if RSSI active

RSSI Pin

Note

The RSSIFET is used to discharge any external capacitor that is connected at the LFDATA pin.

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