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Charge pump features, Charge pump pins, Booster interface – Cypress EZ-OTG CY7C67200 User Manual

Page 6: Booster pins, Crystal interface

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CY7C67200

Document #: 38-08014 Rev. *G

Page 6 of 78

Charge Pump Features

• Meets OTG Supplement Requirements, see

Table 41, “DC

Characteristics: Charge Pump,” on page 66

.

Charge Pump Pins

Booster Interface

EZ-OTG has an on-chip power booster circuit for use with
power supplies that range between 2.7V and 3.6V. The
booster circuit boosts the power to 3.3V nominal to supply
power for the entire chip. The booster circuit requires an
external inductor, diode, and capacitor. During power down
mode, the circuit is disabled to save power.

Figure 2

shows

how to connect the booster circuit.

Component details:

• L1: Inductor with inductance of 10 µH and a current rating

of at least 250 mA

• D1: Schottky diode with a current rating of at least 250 mA

• C1: Tantalum or ceramic capacitor with a capacitance of at

least 2.2 µF

Figure 3

shows how to connect the power supply when the

booster circuit is not being used.

Booster Pins

Crystal Interface

The recommended crystal circuit to be used with EZ-OTG is
shown in

Figure 4

. If an oscillator is used instead of a crystal

circuit, connect it to XTALIN and leave XTALOUT uncon-
nected. For further information on the crystal requirements,
see

Table 39, “Crystal Requirements,” on page 65

.

Table 11.Charge Pump Interface Pins

Pin Name

Pin Number

OTGVBUS

C1

CSwitchA

D1

CSwitchB

D2

Figure 2. Power Supply Connection With Booster

BOOSTVcc

VSWITCH

VCC

AVCC

C1

D1

L1

3.3V

2.7V to 3.6V

Power Supply

Figure 3. Power Supply Connection Without Booster

Table 12.Charge Pump Interface Pins

Pin Name

Pin Number

BOOSTVcc

F1

VSWITCH

E2

Figure 4. Crystal Interface

BOOSTVcc

VSWITCH

VCC

AVCC

3.0V to 3.6V

Power Supply

Y1

C1 = 22 pF

C2 = 22 pF

CY7C67200

XTALIN

XTALOUT

12MHz
Parallel Resonant
Fundamental Mode
500uW
20-33pf ±5%

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