Cypress Semiconductor EZ-Host CY7C67300 User Manual download pdf (Page 23)

CY7C6730

PRELIMINARY

Document #: 38-08015 Rev. *D Page 23 of 120

Component details:

• D1 and D2: Schottky diodes with a current rating greater than 60 mA

• C1: Ceramic capacitor with a capacitance of 0.1 uF

• C2: Capacitor value should be no more that 6.5 uF since that is the maximum capacitance allowed by the USB OTG spec for

a dual-role device. The minimum value of C2 is 1 uF. There are no restrictions on the type of capacitor for C2.

If the VBUS charge pump circuit is not to be used, CSWITCHA, CSWITCHB, and OTGVBUS can be left unconnected.

4.11.4 Charge Pump Features

• Meets OTG Supplement Requirements, see the DC Characteristics: Charge Pump Table 13-2 for details.

4.11.5 Charge Pump Pins.

4.11.6 Booster Interface

EZ-Host 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. The figure below shows how to connect the booster

circuit.

Figure 4-5. Charge Pump

Table 4-16. Charge Pump Interface Pins

Pin Name Pin Number

OTGVBUS 11

CSwitchA 13

CSwitchB 12

VBUS

CSWITCHA

CSWITCHB

OTGVBUS

CY7C67300

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 119 120

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Cypress Semiconductor EZ-Host CY7C67300 User Manual Page 23