CY7C67200

Charge Pump Features

Figure 3. Power Supply Connection Without Booster

Meets OTG Supplement Requirements, see Table 41, “DC Characteristics: Charge Pump,” on page 66.

Charge Pump Pins

Table 11.Charge Pump Interface Pins

Pin Name

Pin Number

OTGVBUS

C1

 

 

CSwitchA

D1

 

 

CSwitchB

D2

 

 

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

BOOSTVcc

VSWITCH

VCC

AVCC

Booster Pins

3.0V to 3.6V Power Supply

how to connect the booster circuit.

Figure 2. Power Supply Connection With Booster

Table 12.Charge Pump Interface Pins

Pin Name

Pin Number

BOOSTVcc

F1

 

 

VSWITCH

E2

BOOSTVcc

VSWITCH

VCC

AVCC

 

2.7V to 3.6V

L1

Power Supply

D1

3.3V

C1

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.

Figure 4. Crystal Interface

XTALIN

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.

CY7C67200

XTALOUT

Y1

C1 = 22 pF

12MHz

Parallel Resonant Fundamental Mode 500uW

20-33pf ±5%

C2 = 22 pF

Document #: 38-08014 Rev. *G

Page 6 of 78

[+] Feedback

Page 6
Image 6
Cypress CY7C67200 manual Charge Pump Interface Pins Pin Name Pin Number, Booster Interface, Crystal Interface