CYWUSB6953_10 datasheet(10/68 Pages) CYPRESS

10 / 68 page

CYRF69103

Document #: 001-07611 Rev *F

Page 10 of 68

The PMU also provides a configurable low battery detection

function which may be read over the SPI interface. One of seven

thresholds between 1.8V and 2.7V may be selected. The

interrupt pin may be configured to assert when the voltage on the

VBAT pin falls below the configured threshold. LV IRQ is not a

latched event. Battery monitoring is disabled when the device is

in sleep mode.

The following three figures show different examples of how to

use PRoC LP with and without the PMU. Figure 8-2. shows the

most common circuit making use of the PMU to boost battery

voltage up to 2.7V. Figure 8-3. is an example of the circuit used

when the supply voltage is always above 2.7V. This could be

three 1.5V battery cells in series along with a linear regulator, or

some similar power source. Figure 8-4. shows an example of

using the PRoC LP with its PMU disabled and an external boost

to supply power to the device. This might be required when the

load is much greater than the 15 mA average load that PRoC can

support.

Figure 8-2. PMU Enabled

Figure 8-3. PMU Disabled - Linear Regulator

Figure 8-4. PMU Disabled - External Boost Converter

PRoC LP

10 µF 6.3V

VCC

100 µF 10V

VBat

BAT400D

10 µH

VCC

VBat

0.047 µF

10 µF

6.3V

1 µF

6.3V

0.047µF

1 Ohm 1%

47 Ohm

VDD_MICRO

VDD

0.1µF

PRoC LP

VCC

0.047µF

VDD_MICRO

VDD

0.1µF

PRoC LP

VCC

VBat

0.047µF

10µF

6.3V

1µF

6.3V

0.047µF

1 Ohm 1%

47 Ohm

External DC-DC

Boost Converter

VDD_MICRO

VDD

0.1µF

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