MC33897ADSLASHR2 datasheet(16/20 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33897/A/B/C/D/T

TYPICAL APPLICATIONS

The 33897/A/C/T can be used in applications where the

module includes a regulator that has the capability of going

into Sleep mode by having an Enable terminal. See Figure 9.

When the module’s regulator is in sleep mode, the module is

turned off. The module waits for a defined wake-up voltage

level on the bus. This wake-up voltage will activate the control

line, which enables the regulator and turns the module back

on. This 33897/A/C/T feature allows the module to be more

energy efficient since the current consumption is significantly

lowered when it goes into sleep mode.

Figure 9. 33897/A/C/T Typical Application Schematic

The 33897B/D do not have a control terminal to enable the

module’s regulator. See Figure 10. The 33897B/D can be

used in applications where board space is limited and there

is no need for the module to have control over its regulator via

the transceiver.

Figure 10. 33897B/D Typical Application Schematic

GND

CNTL

VBATT

LOAD

BUS

RXD

MODE0

TXD

Voltage

Regulator

33897/A/C/T

VCC

MCU

10 k

Ω

2.7 k

Ω

6.49 k

Ω

1.0 k

Ω

Battery

µH

SWC BUS

VCC

Power

MODE1

47 pF

100 pF

Source

4.7

µF

100 nF

GND

VBATT

LOAD

BUS

RXD

MODE0

TXD

33897B/D

VCC

MCU

10 k

Ω

2.7 k

Ω

6.49 k

Ω

1.0 k

Ω

Battery

µH

SWC BUS

VCC

MODE1

47 pF

100 nF

100 pF

4.7

µF

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