P9036B Datasheet, PDF (15/24 Pages) Integrated Device Technology – 12V Wireless Power Transmitter IC for TX-A6

Figure 6 System State Machine Diagram
The P9036B performs four phases: Selection, Ping,
Identification & Configuration, and Power Transfer.
START (SELECTION) PHASE
In this phase, the P9036B operates in a low power mode
to determine if a potential receiver has been placed on the
coil surface prior to the PING state. At regular intervals,
the P9036B applies a brief AC signal sequentially to each
one of the coils of the triple A6 coil and listens for a
response. When a response is found, the P9036B keeps
that coil selected for all subsequent operations.
PING PHASE
In this phase, the P9036B applies a power signal at 175
kHz with a fixed 50% duty cycle and attempts to establish
a communication link with a mobile device.
Required packet(s) in PING:
1. Signal Strength Packet (0x01)
The mobile device must send a Signal Strength Packet
within a time period specified by the WPC, otherwise the
power signal is terminated and the process repeats.
If the P9036B does not detect the start bit of the header
byte of the Signal Strength Packet during the Ping Phase,
it removes the Power Signal after a delay. If a Signal
Strength Packet is received, the P9036B goes to the
Identification and Configuration Phase.
P9036B
Product Datasheet
IDENTIFICATION AND CONFIGURATION (ID & Config)
In this phase, the P9036B tries to identify the mobile
device and collects configuration information.
Required packet(s) in ID & Config:
1. Identification Packet (0x71)
2. Extended Identification Packet (0x81)^*
3. Configuration Packet (0x51)
* _{If Ext bit of 0x71 packet is set to 1.}
Also, the P9036B must correctly receive the following
sequence of packets without changing the operating point
(175 kHz @ 50% duty cycle):
1. Identification Packet (0x71)
2. Extented Identification (0x81)
3. Up to 7 optional configuration packets from the
following set: Power Control Hold-Off Packet (0x06),
Proprietary Packet (0x18 – 0xF2), Reserved Packet
4. Configuration Packet (0x51)
If the P9036B detects a valid configuration sequence, with
the proper timing, then it will move to the Power Transfer
phase. Otherwise, it will terminate the power signal and
revert to the Selection phase.
POWER TRANSFER PHASE
In this phase, the P9036B adapts the power transfer to the
receiver based on control data it receives as contained in
the Control Error Packets.
Required packet(s) in Power Transfer:
1. Control Error Packet (0x03)
2. Rectified Power Packet (0x04)
For this purpose, the P9036B may receive zero or more of
the following packets:
1. Control Error Packet (0x03)
2. Rectified Power Packet (0x04)
3. Charge Status Packet (0x05)
4. End Power Transfer Packet (0x02)
5. Any Proprietary Packet
6. Any reserved Packets
If the P9036B receives a packet that does not comply with
the sequence, or if the time limits for receiving the
Revision 1.0.0
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