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CYW20733A3KFB1G Fiches technique(PDF) 12 Page - Cypress Semiconductor

No de pièce CYW20733A3KFB1G
Description  Single-Chip Bluetooth Transceiver Wireless Input Devices
Download  67 Pages
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Fabricant  CYPRESS [Cypress Semiconductor]
Site Internet  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

CYW20733A3KFB1G Fiches technique(HTML) 12 Page - Cypress Semiconductor

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Document No. 002-14859 Rev. *R
Page 12 of 67
CYW20733
Figure 5. 32-kHz Oscillator Block Diagram
1.8 GPIO Port
The CYW20733 has 40 general-purpose I/Os (GPIOs) in the 81-pin package and 58 GPIOs in the 121-pin package. All GPIOs support
programmable pull-ups and are capable of driving up to 8 mA at 3.3V or 4 mA at 1.8V, except P26, P27, P28, and P29, which are
capable of driving up to 16 mA at 3.3V or 8 mA at 1.8V. GPIO P57 is capable of sinking 100 mA for VDDIO = 3.0V and 60 mA for
VDDIO = 1.62V.
Port 0–Port 1, Port 8–Port 18, Port 20–Port 23, and Port 28–Port 38
All of these pins can be programmed as ADC inputs.
Port 26–Port 29
P[26:29] consist of four pins. All pins are capable of sinking up to 16 mA for LEDs. These pins also have the PWM function, which
can be used for LED dimming.
1.9 Keyboard Scanner
The keyboard scanner is designed to autonomously sample keys and store them into buffer registers without the need for the host
microcontroller to intervene. The scanner has the following features:
Ability to turn off its clock if no keys are pressed.
Sequential scanning of up to 160 keys in an 8 × 20 matrix.
Programmable number of columns from 1 to 20.
Programmable number of rows from 1 to 8.
16-byte key-code buffer (can be augmented by firmware).
128 kHz clock—allows scanning of full 160-key matrix in about 1.2 ms.
N-key rollover with selective 2-key lockout if ghost is detected.
Keys are buffered until host microcontroller has a chance to read it, or until overflow occurs.
Table 6. XTAL Oscillator Characteristics
Parameter
Symbol
Conditions
Minimum
Typical
Maximum
Unit
Output frequency
Foscout
32.768
kHz
Frequency tolerance
Crystal
dependent
100
ppm
Start-up time
Tstartup
500
ms
XTAL drive level
Pdrv
For crystal
selection
0.5
W
XTAL series resistance
Rseries
For crystal
selection
––
70
k
XTAL shunt capacitance
Cshunt
For crystal
selection
––
1.3
pF
C2
C1
R1
32.768 kHz
XTAL


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