IDT P9242-G-EVK User Manual
P9242-G-EVK Evaluation Board User Manual
© 2019 Integrated Device Technology, Inc. 1 February 17, 2019
Description
The P9242-G-EVK Evaluation Board demonstrates the features of
the P9242-G 15W Wireless Power Transmitter (TX) with a fixed
frequency. It is intended to evaluate the functionality and
performance of the P9242-G when combined with a Qi power
receiver in a wireless charging system. The P9242-G-EVK offers
the flexibility to select parameters, such as Q-factor threshold, LED
pattern, power loss FOD threshold, and external temperature
sensing function. The printed circuit board (PCB) has four layers. It
can be used with the user’s WPC-1.2.4 compliant receiver.
The high-efficiency, turnkey reference design is supported by
comprehensive online, digital resources to significantly expedite
the design-in effort and enable rapid prototyping.
Kit Contents
P9242-G-EVK Evaluation Board
Adaptor: 18V/1.38A
Features
P9242-G Evaluation Board with support for WPC-1.2.4
Up to 15W output power
Adjustable open Q-factor threshold
Adjustable power loss FOD threshold
Adjustable temperature shutdown
Two programmable LED status indicators
Four-layer PCB
Fully assembled with test points and coil fixture
P9242-G-EVK Mass-Market Evaluation Board
12V/1.38A AC Adapter (Not to scale)
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Important Notes
Disclaimer
Integrated Device Technology, Inc. and its affiliated companies (herein referred to as “IDT”) shall not be liable for any damages arising out of defects resulting from
(i) delivered hardware or software
(ii) non-observance of instructions contained in this manual and in any other documentation provided to user, or
(iii) misuse, abuse, use under abnormal conditions, or alteration by anyone other than IDT.
TO THE EXTENT PERMITTED BY LAW, IDT HEREBY EXPRESSLY DISCLAIMS AND USER EXPRESSLY WAIVES ANY AND ALL WARRANTIES, WHETHER
EXPRESS, IMPLIED, OR STATUTORY, INCLUDING, WITHOUT LIMITATION, IMPLIED WARRANTIES OF MERCHANTABILITY AND OF FITNESS FOR A
PARTICULAR PURPOSE, STATUTORY WARRANTY OF NON-INFRINGEMENT, AND ANY OTHER WARRANTY THAT MAY ARISE BY REASON OF USAGE
OF TRADE, CUSTOM, OR COURSE OF DEALING.
Restrictions in Use
IDT’s [Kit Name], consisting of the [Kit Contents and Software], is designed for [list of intended purposes] only. IDT’s [Kit Name and Software] must not be used
for [list of prohibited uses].
Contents
1. Hardware Setup ..........................................................................................................................................................................................15
Required or Recommended User Equipment ....................................................................................................................................15
2. Usage Guide ...............................................................................................................................................................................................15
Overview of the P9242-G-EVK ..........................................................................................................................................................15
LED Pattern Selection .......................................................................................................................................................................16
External Temperature Sensing (TS) ..................................................................................................................................................18
External Buck Regulator ....................................................................................................................................................................19
Bypass Path of the External Buck Regulator .....................................................................................................................................20
External Oscillator .............................................................................................................................................................................21
Resonant Capacitor ...........................................................................................................................................................................22
Q-factor Detection and Open Advanced Q-factor ..............................................................................................................................23
Selection of Input Source and Operation Mode .................................................................................................................................25
Transmitter Coil .................................................................................................................................................................................26
3. P9242-G Evaluation Board Schematic .......................................................................................................................................................27
4. Bill of Materials (BOM) ................................................................................................................................................................................28
5. Board Layout ..............................................................................................................................................................................................32
6. Ordering Information ...................................................................................................................................................................................35
7. Revision History ..........................................................................................................................................................................................35
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List of Figures
Figure 1. P9242-G V3.8 Evaluation Board Features ........................................................................................................................................15
Figure 2. P9242-G V3.8 Evaluation Board Detail .............................................................................................................................................16
Figure 3. R61 and R62 Schematic Location .....................................................................................................................................................17
Figure 4. R61 and R62 PCB Location...............................................................................................................................................................18
Figure 5. TH_COIL1, R60, and RC67 Schematic Location ..............................................................................................................................18
Figure 6. TH_COIL1, R60, and RC67 PCB Location ........................................................................................................................................19
Figure 7. Buck Regulator Schematic Location ..................................................................................................................................................19
Figure 8. Buck Regulator PCB Location ...........................................................................................................................................................20
Figure 9. Bypass Path Schematic Location ......................................................................................................................................................20
Figure 10. Buck Regulator PCB Location ...........................................................................................................................................................21
Figure 11. Bypass Path Schematic Location ......................................................................................................................................................21
Figure 12. Buck Regulator PCB Location ...........................................................................................................................................................22
Figure 13. Q-factor Detection Schematic Location .............................................................................................................................................23
Figure 14. Q-factor PCB Location .......................................................................................................................................................................24
Figure 15. Input Source Selection Jumpers on the PCB ....................................................................................................................................25
Figure 16. Silkscreen – Top of Board .................................................................................................................................................................32
Figure 17. Copper – Top Layer ...........................................................................................................................................................................33
Figure 18. Copper L1 Layer ................................................................................................................................................................................33
Figure 19. Copper L2 Layer ................................................................................................................................................................................34
Figure 20. Copper Bottom ..................................................................................................................................................................................34
List of Tables
Table 1. LED Pattern Selection .......................................................................................................................................................................17
Table 2. External Oscillator Selection ..............................................................................................................................................................21
Table 3. Voltage on GPIO_A2 vs. Advanced Q-factor Threshold ....................................................................................................................24
Table 4. P9242-G-EVK Operation Modes .......................................................................................................................................................26
Table 5. Recommend Coil Manufacturer .........................................................................................................................................................26
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1. Hardware Setup
Required or Recommended User Equipment
The following additional lab equipment is required for using the kit:
P9221-G-EVK Transmitter Evaluation Board or any WPC-1.2.4 compliant receiver
Power supply capable of 18V/1.38A
2. Usage Guide
Overview of the P9242-G-EVK
Figure 1. P9242-G V3.8 Evaluation Board Features
Tx Coil
Input Select Jumpers
Vin Power Connector: Micro-USB
Vin Connector: USB-C
Vin Power Connector: Barrel
Green LED and Red LED
J4 I2C Connector
J5 IDT-Reserved Connector – Do Not Use
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Figure 2. P9242-G V3.8 Evaluation Board Detail
Note: The P9242-GB was used instead of the P9242-G IC on the P9242-G V3.8 Evaluation Board. The P9242-G has firmware pre-programmed
into one-time programmable memory and does not let users customize the firmware. The P9242-GB also offers a pre-programmed bootloader
that must be used in conjunction with an external flash. Firmware is loaded into the external flash. Users can customize the firmware in external
flash. There is no functionality difference of the P9242-G V3.8 Evaluation Board using the P9242-G IC or the P9242-GB with external flash.
LED Pattern Selection
The P9242-G-EVK uses two LEDs (LED1 and LED2; see Figure 1) to indicate the power transfer status, faults, and operating modes. The LEDs
are connected to the LED1 and LED2 pins as shown in the P9242-G-EVK schematics.
Buck Compensation
Circuit
External
Oscillator Circuit
P9242-GB IC
Flash IC
Buck IC
Buck Power
Stage Filter
Resonant
Capacitors
High Voltage Input OVP
Circuit
Q-factor
Detection
Circuit
External Flash for
development
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Table 1. LED Pattern Selection
Option
Voltage on GPIO_A3 Pin
LED1/LED2 Pin
Status
Standby
Transfer
Complete
Fault
1
0V ≤ V
GPIO_A3
< 0.1V;
0.7V < V
GPIO_A3
< 0.8V;
1.4V < V
GPIO_A3
< 1.5V;
2.1V < V
GPIO_A3
< 2.4V
LED2
Off
On
Off
Off
LED1
Off
Off
Off
Blink 4Hz
2
0.1V < V
GPIO_A3
< 0.2V;
0.8V < V
GPIO_A3
< 0.9V;
1.5 V< V
GPIO_A3
< 1.6V
LED2
On
On
Off
Off
LED1
On
Off
Off
Blink 4Hz
3
0.2V < V
GPIO_A3
< 0.3V;
0.9V < V
GPIO_A3
< 1.0V;
1.6V < V
GPIO_A3
< 1.7V
LED2
Off
Blink 1Hz
On
Blink 4Hz
LED1
Off
Off
Off
Off
4
0.3V < V
GPIO_A3
< 0.4V;
1.0V < V
GPIO_A3
< 1.1V;
1.7V < V
GPIO_A3
< 1.8V
LED2
Off
On
Off
Blink 4Hz
LED1
Off
Off
Off
Off
5
0.4V < V
GPIO_A3
< 0.5V;
1.1V < V
GPIO_A3
< 1.2V;
1.8V < V
GPIO_A3
< 1.9V
LED2
On
Blink 1Hz
On
Off
LED1
On
Off
Off
Blink 4Hz
6
0.5V < V
GPIO_A3
< 0.6V;
1.2V < V
GPIO_A3
< 1.3V;
1.9V < V
GPIO_A3
< 2.0V
LED2
Off
Off
On
Off
LED1
Off
On
Off
Blink 4Hz
7
0.6V < V
GPIO_A3
< 0.7V;
1.3V < V
GPIO_A3
< 1.4V;
2.0V < V
GPIO_A3
< 2.1V
LED2
Off
Blink 1Hz
On
Off
LED1
Off
Off
Off
Blink 4Hz
The LED patterns can be selected by setting the voltage on the GPIO_A3 pin through the resistor divider R61 and R62 (for options, see Table 1).
On the evaluation board, the GPIO_A3 pin is pulled up to GND through R62. R61 is unpopulated; therefore, option 1 is the default option.
Figure 3. R61 and R62 Schematic Location
FOD AND LED PAT
R58 20K
R59
10k
R61 10K
FOD_ADJ
R62
10k
LDO33
LED_PAT
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Figure 4. R61 and R62 PCB Location
External Temperature Sensing (TS)
The P9242-G includes an optional temperature sense input pin, TS, that is used to monitor a remote temperature, such as for a coil or a battery
charger. The TS pin voltage can be calculated using Equation 1.
Equation 1
Where NTC is the thermistor’s resistance (RTH1) and R60 is the pull-up resistor connected to the 3.3V supply voltage on the P9242-G Evaluation
Board. The over–temperature shutdown is triggered if the voltage on the TS pin is lower than 0.6V, and recovers at 0.8V. The RTH1 is not
populated on the P9242-G Evaluation Board.
Figure 5. TH_COIL1, R60, and RC67 Schematic Location
R60
10K
C67
0.1uF
OTP
OTP
t
TH_Coil1
COIL TEMPERATURE SENSING
LDO33
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Figure 6. TH_COIL1, R60, and RC67 PCB Location
External Buck Regulator
To operate at a fixed 127.7kHz frequency, the P9242-G-EVK has adopted an MP2229 Buck IC to adjust the power transfer between the transmitter
and receiver. GPIO_A4 and GPIO_B4 are assigned to adjust the MP2229 FB control. The MP2229 is operating at a fixed 500kHz frequency on
the board. The Buck regulator power stage is designed to accommodate a wide range of input voltages. The feedback loop combined with the
external PWM signal are designed for the MP2229, and are not recommended to be changed. The resolution of the MP2229 is about 35mV. The
Buck and external components in the PCB layout should be isolated from any noise generating circuits.
Figure 7. Buck Regulator Schematic Location
R13 18K
C10
22uF
R79
NP
R16
5.1K
BK_EN
C6
22uF
C11
0.1uF
BK_VIN
C14
NPC15
0.1uF
Q12
NP
C71 NP
C9 0.1uF
R96
0
R7 10
R11
150K
C4
22uF
R97
0
C12
0.1uF
C5
0.1uF
L3 10uH
BK_ADJ
R14
3.3K
BK_VIN
U1
MP2229
VCC
9
EN
4
LPM
5
FREQ/SYNC
8
BST
10
SW1
2
FB
6
SS
7
IN
3
SW2
11
GND1
1
INPAD
15
R67
0
C16
0.1uF
C13
NP
R12
30k
BK_FB
R95
10K
R66
NP
R15
30k
D6
SMAJ20CA-13-F
BK_SW
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