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CYW20733A3KFB1G Fiches technique(PDF) 12 Page - Cypress Semiconductor |
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CYW20733A3KFB1G Fiches technique(HTML) 12 Page - Cypress Semiconductor |
12 / 67 page 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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Description similaire - CYW20733A3KFB1G |
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