CY8C3245AXI-158 Datasheet, PDF (35/128 Pages) Cypress Semiconductor – Programmable System-on-Chip (PSoC®)

PSoC^® 3: CY8C32 Family Data Sheet
Figure 6-6. Application of Boost Converter powering PSoC device
External
Load
Schottky, 1A
4.7 µH
10 µH
22 µH
22 µF
0.5–3.6 V
PSoC
VDDA
VDDD
VBOOST
IND
VBAT
VSSB
VDDD
VDDIO0
Boost VDDIO2
Logic
VDDIO1
VDDIO3
VSSA
VSSD
0.1 µF 1.0 µF
0.1 µF 1.0 µF
0.1 µF 1.0 µF
0.1 µF
0.1 µF
0.1 µF
0.1 µF
22 µF
All components and values are required
The boost converter may also generate a supply that is not used
directly by the PSoC device. An example of this use case is
boosting a 1.8 V supply to 4.0 V to drive a white LED. If the boost
converter is not supplying the PSoC devices V_DDA, V_DDD, and
V_DDIO it must comply with the same design rules as supplying
the PSoC device, but with a change to the bulk capacitor
requirements. A parallel arrangement 22 µF, 1.0 µF, and 0.1 µF
capacitors are all required on the Vout supply and must be
placed within 1 cm of the VBOOST pin to ensure regulator
stability.
Figure 6-7. Application of Boost Converter not powering PSoC device
V_OUT
External
Load
PSoC
VDDA
22 µF 1.0 µF 0.1 µF
Schottky, 1A
4.7 µH
10 µH
22 µH
22 µF
0.5–3.6 V
VDDD
VBOOST
IND
VBAT
VSSB
VDDD
VDDIO0
Boost VDDIO2
Logic
VDDIO1
VDDIO3
VDDA, VDDD, and
VDDIO connections
per section 6.2
Power System.
VSSA
VSSD
All components and values are required
The switching frequency is set to 400 kHz using an oscillator
integrated into the boost converter. The boost converter can be
operated in two different modes: active and standby. Active
mode is the normal mode of operation where the boost regulator
actively generates a regulated output voltage. In standby mode,
most boost functions are disabled, thus reducing power
consumption of the boost circuit. Only minimal power is provided,
typically < 5 µA to power the PSoC device in Sleep mode. The
Document Number: 001-56955 Rev. *Y
Page 35 of 128