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Evaluates: MAX77950

MAX77950 Evaluation Kit

RXMODE

In the

RXMODE tab, the registers associated with the

receiver mode function can be examined. Some registers

are writable and can be changed by the user.

● The LDO output voltage (VOUTSET) and the LDO cur-

rent limit (LDO_ILMITSET) can be changed by the

user. As seen in box #1 in Figure 3, the default value

of VOUT is 5V.

• Click

Read to ensure that the current value in the

• Adjust the slide bar to set the value desired and

send the changes to the IC by clicking the

Write

button next to the slide bar.

• Repeat the steps to change the LDO current limit

(box #2).

● The end-power-transfer (EPT) packet can be sent

manually by the GUI along with the reason for EPT.

The reason for EPT must be set before sending the

EPT packet (Figure 3).

• By sliding the cursor, the reason for EPT can be se-

lected. Click

Write to fix the values of EPT reason

on the EPT_REASON register (box #3).

• To send the EPT packet, toggle the switch next to

the

Send EPT in box #4 and then click the Write

button (#5) in the

RX_COM group box.

● The proprietary packet (PPP) can also be sent by the

IC. The user can practice sending a PPP using the

GUI. In WPC specifications, several PPPs are de-

fined and they have a message length up to 20 bytes.

The IC supports the PPP that supports up to 5 bytes

of the message.

The following example procedure is for sending a PPP

with the GUI:

● Decide on the PPP with the designed message length

(in this example, it is 3)

● Write the PPP_HEADER as 0x38 because the PPP

that starts with the 0x38 header is defined to have 3

bytes of the message in the specification (box #6).

● Write 3 bytes of message in the RX_DATA_VAL-

UE0/1/2 (box #7).

● Toggle on the SEND_RX_DATA bit (box #8) and send

by clicking the

Write button (box #5).

Figure 3. MAX77950 EV Kit GUI (RXMODE Tab)

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