The Cypress CYW20736 is a an advanced Bluetooth Low Energy SoC that supports wireless charging profile. The CYW20736 is
designed to support the entire spectrum of Bluetooth Low Energy use cases for the medical, home automation, accessory, sensor,
Internet Of Things, and wearable market segments.
The CYW20736 radio has been designed to provide low power, low cost, and robust communications for applications operating in
the globally available 2.4 GHz unlicensed Industrial, Scientific, and Medical (ISM) band.
The single-chip Bluetooth low energy SoC is a monolithic component implemented in a standard digital CMOS process and requires
minimal external components to make a fully compliant Bluetooth device. The CYW20736 is available in a 32-pin, 5 mm × 5 mm
32-QFN package as well as WLCSP. CYW20736 device is supported in WICED SDK 2.x
Cypress Part Numbering Scheme
Cypress is converting the acquired IoT part numbers from Broadcom to the Cypress part numbering scheme. Due to this conversion,
there is no change in form, fit, or function as a result of offering the device with Cypress part number marking. The table provides
Cypress ordering part number that matches an existing IoT part number.
Table 1. Mapping Table for Part Number between Broadcom and Cypress
Broadcom Part Number
BCM20736
BCM20736A1KML2G
BCM20736A1KWBGT
CYW20736
CYW20736A1KML2G
CYW20736A1KWBGT
Cypress Part Number
Features
The following profiles are
■
■
■
■
■
■
■
■
Applications
supported
1
in ROM:
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
AirFuel wireless charging
Bluetooth Low Energy (BLE)-compliant
Infrared modulator
IR learning
Supports Adaptive Frequency Hopping
Excellent receiver sensitivity
10-bit auxiliary ADC with nine analog channels
On-chip support for serial peripheral interface (master and
slave modes)
Broadcom Serial Communications interface (compatible with
NXP I
2
C slaves)
Programmable output power control
Integrated ARM Cortex-M3 based microprocessor core
Automation Profile
Support for secure OTA
On-chip power-on reset (POR)
Support for EEPROM and serial flash interfaces
Integrated low-dropout regulator (LDO)
On-chip software controlled power management unit
Package type:
❐
32-pin 32-QFN package (5 mm × 5 mm)
❐
80-pin WLCSP package (2104 µm × 2085 µm)
RoHS compliant
Battery status
Blood pressure monitor
Find me
Heart rate monitor
Proximity
Thermometer
Weight scale
Time
Additional profiles that can be supported
1
from RAM include:
■
■
■
Blood glucose monitor
Temperature alarm
Location
■
1. Full qualification and use of these profiles may require FW updates from Cypress. Some of these profiles are under development/approval at the Cypress SIG and
conformity with the final approved version is pending. Contact your supplier for updates and the latest list of profiles.
Cypress Semiconductor Corporation
Document Number: 002-14883 Rev. *I
•
198 Champion Court
•
San Jose
,
CA 95134-1709
•
408-943-2600
Revised June 30, 2017
CYW20736
Figure 1. Functional Block Diagram
Muxed on GPIO
UART_TXD
UART_RXD
WDT
Processing
Unit
(ARM -CM3)
Test
UART
Tx RTS_N
Rx
CTS_N
SDA/
MOSI
1.2V
SCL/
SCK MISO
VDD_CORE
1.2V
1.2V VDD_CORE
Domain
Periph 320K
UART ROM
60K
RAM
BSC/SPI
Master
Interface
(BSC is I
2
C -
compa ble)
VSS,
VDDO,
VDDC
28 ADC
Inputs
1.2V
POR
1.2V
LDO
CT
ADC
1.425V to 3.6V
3.6V
MIA POR
System Bus
1.62V to 3.6V
32 kHz
LPCLK
hclk
(24 MHz to 1 MHz)
Peripheral
Interface
Block
RF Control
and Data
Volt. Trans
I/O Ring
Control
Registers
VDD_IO
Domain
I/O Ring Bus
Bluetooth
Baseband
Core
2.4 GHz
Radio
24
MHz
GPIO
Control/
Status
Registers
IR
Mod.
and
Learning
SPI
M/S
PMU
Power
WAKE
RF I/O
T/R
Switch
Frequency
Synthesizer
14 GPIOs
IR
I/O
High Current
Driver Controls
32 kHz
LPCLK
AutoCal
128 kHz
LPO
128 kHz
LPCLK
1.2V VDD_RF
Domain
9 ADC
Inputs
PWM
÷4
24 MHz
Ref Xtal
32 kHz
1.62V to 3.6V
VDD_IO
IoT Resources
Cypress provides a wealth of data at
http://www.cypress.com/internet-things-iot
to help you to select the right IoT device for your
design, and quickly and effectively integrate the device into your design. Cypress provides customer access to a wide range of
information, including technical documentation, schematic diagrams, product bill of materials, PCB layout information, and software
updates. Customers can acquire technical documentation and software from the Cypress Support Community website
6. Ordering Information .................................................. 44
A. Appendix: Acronyms and Abbreviations ............... 45
Document History .......................................................... 46
Sales, Solutions, and Legal Information ...................... 47
Document Number: 002-14883 Rev. *I
Page 3 of 47
CYW20736
1. Functional Description
1.1 Bluetooth Baseband Core
The Bluetooth Baseband Core (BBC) implements all of the time-critical functions required for high performance Bluetooth operation.
The BBC manages the buffering, segmentation, and data routing for all connections. It also buffers data that passes through it, han-
dles data flow control, schedules ACL TX/RX transactions, monitors Bluetooth slot usage, optimally segments and packages data
into baseband packets, manages connection status indicators, and composes and decodes HCI packets. In addition to these func-
tions, it independently handles HCI event types and HCI command types.
The following transmit and receive functions are also implemented in the BBC hardware to increase TX/RX data reliability and secu-
rity before sending over the air:
■
■
Receive Functions: symbol timing recovery, data deframing, forward error correction (FEC), header error control (HEC), cyclic
redundancy check (CRC), data decryption, and data dewhitening.
Transmit Functions: data framing, FEC generation, HEC generation, CRC generation, link key generation, data encryption, and data
whitening.
1.1.1 Frequency Hopping Generator
The frequency hopping sequence generator selects the correct hopping channel number depending on the link controller state,
Bluetooth clock, and device address.
1.1.2 E0 Encryption
The encryption key and the encryption engine are implemented using dedicated hardware to reduce software complexity and pro-
vide minimal processor intervention.
1.1.3 Link Control Layer
The link control layer is part of the Bluetooth link control functions that are implemented in dedicated logic in the Link Control Unit
(LCU). This layer consists of the Command Controller, which takes software commands, and other controllers that are activated or
configured by the Command Controller to perform the link control tasks. Each task performs a different Bluetooth link controller state.
STANDBY and CONNECTION are the two major states. In addition, there are five substates: page, page scan, inquiry, and inquiry
scan.
1.1.4 Adaptive Frequency Hopping
The CYW20736 gathers link quality statistics on a channel-by-channel basis to facilitate channel assessment and channel map
selection. The link quality is determined by using both RF and baseband signal processing to provide a more accurate frequency
hop map.
1.1.5 Bluetooth Low Energy Profiles
The CYW20736 supports Bluetooth low energy, including the following profiles that are supported
1
in ROM:
■
■
■
■
■
■
■
■
■
■
■
Battery status
Blood pressure monitor
Find me
Heart rate monitor
Proximity
Thermometer
Weight scale
Time
AirFuel wireless charging
Automation profile
Support for secure OTA
1. Full qualification and use of these profiles may require FW updates from Cypress. Some of these profiles are under development/approval at the Bluetooth SIG and
conformity with the final approved version is pending. Contact your supplier for updates and the latest list of profiles.
Document Number: 002-14883 Rev. *I
Page 4 of 47
CYW20736
The following additional profiles can be supported
1
from RAM:
■
■
■
■
Blood glucose monitor
Temperature alarm
Location
Custom profile
1.1.6 Test Mode Support
The CYW20736 fully supports Bluetooth Test mode, as described in the Bluetooth low energy specification.
1.2 Infrared Modulator
The CYW20736 includes hardware support for infrared TX. The hardware can transmit both modulated and unmodulated wave-
forms. For modulated waveforms, hardware inserts the desired carrier frequency into all IR transmissions. IR TX can be sourced
from firmware-supplied descriptors, a programmable bit, or the peripheral UART transmitter.
If descriptors are used, they include IR on/off state and the duration between 1–32767 µsec. The CYW20736 IR TX firmware driver
inserts this information in a hardware FIFO and makes sure that all descriptors are played out without a glitch due to underrun (see
Figure 2).
Figure 2. Infrared TX
1.3 Infrared Learning
The CYW20736 includes hardware support for infrared learning. The hardware can detect both modulated and unmodulated sig-
nals. For modulated signals, the CYW20736 can detect carrier frequencies between 10 kHz–500 kHz and the duration that the sig-
nal is present or absent. The CYW20736 firmware driver supports further analysis and compression of learned signal. The learned
signal can then be played back through the CYW20736 IR TX subsystem (see
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