Cypress EZ-PD CY4533 Manual - Halaman 11

Jelajahi secara online atau unduh pdf Manual untuk Motherboard Cypress EZ-PD CY4533. Cypress EZ-PD CY4533 20 halaman. Barrel connector replacement (bcr) evaluation kit

Halaman Cetak

2.3.3 VBUS Voltage and Current Selectors

Figure 2-7. Four Resistor Dividers that Select VBUS Voltage and Current

The range of voltages and currents that the BCR device will negotiate with the USB Type-C power adapter is determined by

a set of resistor dividers.

The dividers on the VBUS_MIN and VBUS_MAX pins of the BCR (R3 and R5 for VBUS_MAX, R11 and R14 for VBUS_MIN)

determine the minimum and maximum voltages that BCR will negotiate. By default, VBUS_MIN is set to 0V, and the 5-position

switch is used to determine the VBUS_MAX value. However, for customers using the BCR device for their end application,

the VBUS_MAX voltage can be finalized using the resistor divider network values as shown in

5-position switch SW1. If you want to use the resistor divider network on the kit for VBUS_MAX, then the switch SW1 must

be at position 5.

For example, if the divider on VBUS_MIN is set to 9V (i.e. R11 = 5kΩ pull-up, R14 = 1kΩ pull-down) and VBUS_MAX is set

to 12V (R3 = 5kΩ pull-up, R5 = 2.4kΩ pull-down), the BCR device will request any voltage between 9V and 12V from the

power adapter, always preferring the highest voltage. See

values.

Table 2-2. Resistor Divider Values for Achieving Desired VBUS_MIN and VBUS_MAX Voltages

Voltage on VBUS_MAX or

VBUS_MIN Pin of BCR

Device (V)

3.3 * (0/6)

3.3 * (1/6)

3.3 * (2/6)

3.3 * (3/6)

3.3 * (4/6)

3.3 * (6/6)

If the power adapter cannot supply 9V or 12V, or power in between, BCR will turn the load switch OFF and will assert FAULT.

Similarly, the dividers on ISNK_COARSE and ISNK_FINE determine the Operating Current communicated to

the Type-C power adapter (in the Request Data Object; see Section 6.4.2 of the USB-PD Specification Rev 3.0

Version 1.2). The Operating Current value (ISNK) is the sum of currents indicated by ISNK_COARSE and

ISNK_FINE. By default, the maximum current is set to 900mA. See

pull-up and pull-down resistor values for the resistor dividers on ISNK_COARSE and ISNK_FINE respectively.

CY4533 EZ-PD™ BCR Evaluation Kit Guide, Document Number: 002-25263 Rev. *B

Table 2-2

Pull-Up Resistor Value

Correlated VBUS

Voltage(V)

as an example for the pull-up and pull-down resistor

Pull-Down Resistor Value

for R3 or R11 (kΩ)

None (DNP)

and

Table 2-4

Table 2-3

Hardware

Table 2-2

instead of using the

for R5 or R14 (kΩ)

2.4

None (DNP)

as examples for the