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CYWUSB6953 数据表(PDF) 10 Page - Cypress Semiconductor

部件名 CYWUSB6953
功能描述  Programmable Radio on Chip Low Power
PDF  68 Pages
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制造商  CYPRESS [Cypress Semiconductor]
网页  http://www.cypress.com
标志 CYPRESS - Cypress Semiconductor

CYWUSB6953 数据表(HTML) 10 Page - Cypress Semiconductor

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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
0.047 µF
0.047 µF
0.047 µF
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
0.047µF
0.047µF
0.047µF
0.047µF
0.047µF
0.047µF
0.047µF
VDD_MICRO
VDD
0.1µF
PRoC LP
VCC
VBat
0.047µF
0.047µF
0.047µF
0.047µF
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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