CWQ1000
®
Datasheet
Qi Compliant 15W
Wireless Power Transmitter IC
General Description
CWQ1000 can deliver up to 15W as a highly-integrated single-chip wireless medium power transmitter IC. It can
be configured to receive its input power from USB or AC adapter. Our chip integrates a power amp driver, a wide
range DCDC converter, and communication controllers which use Amplitude Shift Keying (ASK) and Frequency
Shift Keying (FSK). Our chip includes a 32-bit ARM Cortex M0 processor in order to offer high level of
programmability according to its applications. Communication and control units (CCU) can accommodate WPC
protocol including fault condition handling associated with power transfer. The CCU supports the foreign object
detection (FOD) extension. Also, the chip includes over-temperature and voltage protection.
Features Overview
WPC-1.2.4 compliant for MP-A2 medium power
specification
High-efficiency power transfer system
supporting baseline power profile (<5W) and
extended power profile (<15W)
-
Overall system efficiency up to 90%
Input operating voltage of 4.5V to 20V,
supporting USB and AC adapter
Integrated pre-amplify drivers for external
power amp
Integrated high-efficiency DCDC converter
Integrated 32-bit ARM Cortex M0 processor
-
SRAM for program memory and data memory
FSK modulation for PTx to PRx
ASK demodulation for PRx to PTx
Bi-directional channel communication
-
-
12-bit ADC for voltage/current measurement
I2C programmable interface
Foreign object detection
Current sensing
Over voltage protection
Over current limit
Over-temperature protection
Optional external power amp configuration
128-bit One-Time-Programmable Device
Low standby power
Applications
-
-
Wireless charging pads
Wireless power solutions for Mobile
Applications
Datasheet (REV. 1.4)
Information furnished by CELFRAS is believed to be accurate and
reliable. However, no responsibility is assumed by CELFRAS for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of CELFRAS.
World Wide Web Site: www.celfras.com
Revised 2018-07-26
CWQ1000
Qi Compliant 15W Wireless Power Transmitter IC
1. Description for Implementation
Figure 1. CWQ1000 Block Diagram
1.1
Overview
A wireless power charging system is composed of transmitter and receiver. In general, wireless power
transmitter will transfer AC power using a power amplifier through a TX inductor coil. Then wireless power
receiver will receive AC power through an RX inductor coil which is strongly coupled with the TX coil. In
transmitter part, power amplifier (PA) will change the DC power to AC power and transfer the AC power to
the TX coil.
Figure1 shows the block diagram of CWQ1000 wireless charging transmitter IC. CWQ1000 transmitter will
support power transfer up to 15W and it is compliant with WPC 1.2.4 standard. It consists of power amp
driver, step down DC-DC converter, internal LDOs, ADC, 32-bit ARM M0 MCU, SRAM and etc.
1.2
DC-DC Converter
CWQ1000 employs an internal step down DC-DC converter in order to reduce its power consumption. The
DC-DC converter supplies the power used by internal building blocks. However, the DC-DC converter is not
the main power transfer path in CWQ1000.
The DC-DC converter in CWQ1000 will support bypass mode according to the transmitter input voltage
VIN. When the VIN voltage is high DC-DC converter will operate to save power consumption, oppositely when
the VIN voltage is low it will be bypassed because the power consumption due to the DC-DC operation can
be greater. The DC-DC converter in CWQ1000 also will support PWM (Pulse Width Modulation) and PFM (Pulse
Frequency Modulation) function according to its load current.
CELFRAS, Inc.
-2-
CWQ1000 Datasheet (Rev 1.4)
CWQ1000
Qi Compliant 15W Wireless Power Transmitter IC
1.3
Power Amp Driver
The power amplifier of CWQ1000 consists of four external power NLDMOSs and internal driver circuits.
The power amp driver also includes boosting circuits for driving external high side NLDMOS. Each gate
control signal can be adjusted by internal control and MCU.
The power amplifier of CWQ1000 converts input DC power to AC power and transfers it directly to the TX
coil. Since power amplifier directly influences the overall transmitter efficiency, the gate control of power
MOSFET switches is very important. The power amp driver of CWQ1000 changes its switching frequency and
duty cycle according to the load current and feedback from the receiver.
1.4
FSK Modulator
The Qi extended power profile (EPP) uses two-way communication for power transfer. In the Qi standard,
TX to RX communication is accomplished by frequency shift keying (FSK) modulation over the power signal
frequency.
CWQ1000 power transmitter uses FSK modulation for transmitting protocol data to the power receiver.
CWQ1000 changes the period of the power transfer signal by counting the internal 60MHz oscillator. The
frequency deviation between the base operating frequency f
OP
and the modulation frequency f
MOD
is
designed according to the Qi EPP standard.
1.5
ASK Demodulator
In the Qi standard, RX to TX communication is accomplished by amplitude shift keying (ASK) modulation
with a bit rate of 2Kbps. CWQ1000 power transmitter uses an external peak detection circuit and an internal
comparator circuit for ASK demodulation. The external peak detection circuit include diode and filtering
capacitors and resistors. The ASK demodulator in CWQ1000 demodulates the WPC standard 2kHz bi-phase
signal from the power receiver.
1.6
ADC
CWQ1000 power transmitter employs 12-bit SAR ADC because it has low power, small area characteristics
and moderate speed performance. ADC monitors important internal voltages and currents and gives the
system information to the digital controller.
1.7
Protection
CWQ1000 power transmitter employs various protection schemes in order to prevent system damage.
When the external power amplifier current is too large, the OCL (Over Current Limit) function will limit the
output current. When the temperature inside or outside the chip is too high, the OTP (Over Temperature
Protection) function will shut down the transmitter system to prevent damage resulting from excessive
thermal stress under fault conditions.
1.8
Digital Controller
Digital controller of CWQ1000 is composed of a 32-bit ARM Cortex M0 processor, OTP, SRAM for program
and data memory, etc. Digital controller controls all the analog blocks and entire system to perform power
transfer operation according to the wireless power transfer Qi standard. CWQ1000 supports the eight GPIO
pins and two of them can be dedicated to I2C interface for communication with external host.
CELFRAS, Inc.
-3-
CWQ1000 Datasheet (Rev 1.4)
CWQ1000
Qi Compliant 15W Wireless Power Transmitter IC
2. Pin-out and description
Figure 2. CWQ1000 Pin Configuration (QFN 40-pin 5mm x 5mm, 0.4mm pitch)
2.1
Pin Description
Name
VPP
LDO33
Type
I
O
Description
8V high voltage power for OTP programming. During the normal operation,
connect this pin to LDO33.
Internal 3.3V LDO output pin for capacitor connection.
Pin Number
1
2
CELFRAS, Inc.
-4-
CWQ1000 Datasheet (Rev 1.4)
CWQ1000
Qi Compliant 15W Wireless Power Transmitter IC
3
4
5
6
7
8
9
10
11
12
13
14
15
16,17,18
19,20,21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
LDO18
GND_DCDC
DCDC_SW
VIN
LDO_IN
LDO50
ENB
GND_REF
LED1
LED2
VDD_IO
GPIO0_SCL
GPIO1_SDA
GPIO [2:7]
PA_GH2
PA_BST2
PA_SW2
PA_GL2
GND_DRV
PA_GL1
PA_SW1
PA_BST1
PA_GH1
VDD_DRV
PA_BRG
ANA_TEST
EXT_TS
DMOD_VIN
COIL_VIN
IS_OUT
GND_SNS
O
I
I
O
I
I
O
I
I
I
O
O
O
I
I/O
I/O
I/O
O
I
I
O
O
I
I
O
I
O
Internal 1.8V LDO output pin for capacitor connection.
Ground for DCDC block.
Switching node of DCDC converter. Connect this pin to the external inductor
for DCDC converter.
DC power input for power transmission.
DCDC converter output and input power supply for internal LDOs.
Internal 5V LDO output pin for capacitor connection.
Active-low enable pin for the entire chip.
Ground for internal reference block.
Open drain output for LED connection
Open drain output for LED connection
Input power supply for GPIO0~7. The operating range of this pin is 1.8~5.0V.
General purpose input/output 0. This pin can be dedicated for I
2
C clock input
for internal register access.
General purpose input/output 1. This pin can be dedicated for I
2
C data
input/output for internal register access.
General purpose input/output [2:7].
PA gate driver output for the high side FET of half bridge 2.
PA bootstrap capacitor connection pin for driving the high-side FET of half
bridge 2.
PA switching node for half bridge 2.
PA gate driver output for the low side FET of half bridge 2.
Ground for PA driver.
PA gate driver output for the low side FET of half bridge 1.
PA switching node for half bridge 1.
PA bootstrap capacitor connection pin for driving the high-side FET of half
bridge 1.
PA gate driver output for the high side FET of half bridge 1.
Input power supply for the PA drivers.
PA bridge voltage sensing pin.
Analog test output pin.
External temperature sensor input. Connect this pin to external NTC
thermistor. If not used, connect this pin to LDO33.
Voltage sensing input pin for ASK demodulation.
Q factor Measurement
Input current sensor output.
Ground for internal sensors.
CELFRAS, Inc.
-5-
CWQ1000 Datasheet (Rev 1.4)
微控制器 MCU
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