MC33696FJAER2 datasheet(7/64 Pages) FREESCALE

Part #	MC33696FJAER2

Description	PLL Tuned UHF Transceiver for Data Transfer Applications

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Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

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Supply Voltage Monitoring and Reset

MC33696 Data Sheet, Rev. 9

Freescale Semiconductor

7

Figure 2. Wiring Diagrams

A second voltage regulator supplies the digital part. This regulator is powered from pin VCCDIG and its

output is connected to VCCDIG2. An external capacitor must be inserted between VCCDIG2 and

GNDDIG, for decoupling. The supply voltage VCCDIG2 is equal to 1.6 V. In standby mode, this voltage

regulator goes into an ultra-low-power mode, but VCCDIG2 = 0.7 x VCCDIG. This enables the internal

registers to be supplied, allowing configuration data to be saved.

7

Supply Voltage Monitoring and Reset

At power-on, an internal reset signal is generated. All registers are reset.

When the LVDE bit is set, the low-voltage detection module is enabled. This block compares the supply

voltage on VCCINOUT with a reference level of about 1.8 V. If the voltage on VCCINOUT drops below

1.8 V, status bit LVDS is set. The information in status bit LVDS is latched and reset after a read access.

NOTE

If LVDE = 1, the LVD module remains enabled. The circuit cannot be put

in standby mode, but remains in LVD mode with a higher quiescent current,

due to the monitoring circuitry. LVD function is not accurate in standby

mode.

8

Receiver Functional Description

The receiver is based on a superheterodyne architecture with an intermediate frequency (IF) of 1.5 MHz

(see Figure 1). Its input is connected to the RFIN pin. Frequency down conversion is done by a high-side

3V Operation

5V Operation

1

2

3

4

5

6

7

8

17

18

19

20

21

22

23

24

RSSIOUT

VCC2RF

RFIN

GNDLNA

VCC2VCO

GNDPA1

RFOUT

GNDPA2

SEB

SCLK

MOSI

MISO

CONFB

DATACLK

RSSIC

GNDDIG

VCC2

U11

MC33696

VCC2

3 V

VCC2

1

2

3

4

5

6

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RSSIOUT

VCC2RF

RFIN

GNDLNA

VCC2VCO

GNDPA1

RFOUT

GNDPA2

SEB

SCLK

MOSI

MISO

CONFB

DATACLK

RSSIC

GNDDIG

VCC2

U11

MC33696

VCC2

5 V

VCC2

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MC33696FJAER2 Datasheet(PDF) 7 Page - Freescale Semiconductor, Inc

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