CYW20738
1.5.6 Test Mode Support
The CYW20738 fully supports Bluetooth Test mode, as described in the Bluetooth Low Energy specification.
1.6 ADC Port
The CYW20738 contains a 16-bit ADC (effective number of bits is 10).
Additionally:
■ There are 29 analog input channels in the 64-pin package, and 13 analog input channels in the 40-pin package. All channels are
multiplexed on various GPIOs.
■ The conversion time is 10 s.
■ There is a built-in reference with supply- or band-gap based reference modes.
■ The maximum conversion rate is 187 kHz.
■ There is a rail-to-rail input swing.
The ADC consists of an analog ADC core that performs the actual analog-to-digital conversion and digital hardware that processes
the output of the ADC core into valid ADC output samples. Directed by the firmware, the digital hardware also controls the input
multiplexers that select the ADC input signal Vinp and the ADC reference signals Vref
.
Table 2. ADC Modes
Mode
ENOB (Typical)
Maximum Sampling Rate (kHz)
Latencya (s)
0
1
2
3
4
13
12.6
12
5.859
11.7
171
85
21
11
5
46.875
93.75
187
11.5
10
a. Settling time after switching channels.
1.7 Serial Peripheral Interface
The CYW20738 has two independent SPI interfaces. One is a master-only interface and the other can be either a master or a slave.
Each interface has a 16-byte transmit buffer and a 16-byte receive buffer. To support more flexibility for user applications, the
CYW20738 has optional I/O ports that can be configured individually and separately for each functional pin, as shown in Table 3. The
CYW20738 acts as an SPI master device that supports 1.8V to 3.3V SPI slaves, as shown in Table 3. The CYW20738 can also act
as an SPI slave device that supports a 1.8V to 3.3V SPI master using the second SPI interface, as shown in Table 3.
Table 3. CYW20738 First SPI Set (Master Mode)
Pin Name
Configuration set 1
Configuration set 2
SPI_CLK
SCL
SPI_MOSI
SDA
SPI_MISO
P24
SPI_CSa
–
–
SCL
SDA
P26
Configuration set 3
SCL
SDA
P32
P33
(Default for serial flash)
Configuration set 4
SCL
SDA
P39
–
a. Any GPIO can be used as SPI_CS when SPI is in master mode.
Document Number: 002-14891 Rev. *C
Page 7 of 42
CYPRESS [ CYPRESS ]
