P9028AC datasheet(20/39 Pages) RENESAS

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P9028AC

Product Datasheet

Revision 1.0.3

PMA MODE CHARACTERISTICS

STARTUP AND COMMUNICATION

Before the receiver is placed on the transmitter pad, the

transmitter is in the Standby state. In Standby, the

transmitter is waiting to detect any new, detectable object.

Once the receiver is placed on the PMA transmitter pad,

there are two states that the system must pass through

before power transfer begins. These states are: Digital

Ping, and Identification and the final two states are: Power

Transfer, and End-of-Charge (EOC).

Figure 15. Simplified PMA-State Machine.

Table 8. Receiver Power Transfer Operation.

In Standby, the transmitter is waiting to detect an object

on its pad. Once detected the transmitter tries to initiate

communication, emitting a predetermined signal called a

“Digital Ping”. If the receiver is aligned well enough to

energize and if it responds in the correct manner, it is

recognized by the transmitter as a PMA capable device.

At this point, if the Identification state is not supported, the

transmitter starts transmitting power to the receiver. If the

Identification state is supported, the receiver sends its

unique RXID to the transmitter, which identifies it as a fully

compliant PMA device. After that transaction, the system

enters the Power Transfer state and power transfer from

the transmitter to receiver begins.

The 5V LDO is enabled when the power transfer mode is

initiated and the voltage at VRECT, the output of the full-

wave synchronous rectifier, is more than 5.6V.

PMA EOC

A receiver that transmits a PMA EOC signal shall

remain in the power transfer phase but shall disable its

output and shall continue to transmit PMA EOC signals

until the transmitter removes the power. The P9028AC

operation is summarized in table 8 from the PMA

specification:

DESCRIPTION

SYMBOL

VALUE

UNITS

Maximum period in power transfer phase IOUT<ICC before transmitting PMA EOC

signal

TEOC

min

Charge complete threshold current

Icc

0.05 x ILIM

No load threshold current

INoLoad

Time to enter No load EOC

INoLoad_EOC

sec

Maximum receiver temperature

TRx_max

°C

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