Microcontroller selection

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RARA_2227736
Level 2
Level 2

Hi

i need to interface 4 digit 7 segment display , 7 LED , 3 cap sense, I2C communi, two timer.

option 1

28 I/O , timer -2 nos , I2C-1 nos.

option 2

option 1 with 3 cap sense buttons.

kindly share the part number available with less cost. frequency 12MHz also fine. i need to reduce the cost. so kindly help me to get the correct controller with less cost for the option 1 and option 2.

Regards

Rajakumar.R

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1 Solution
Hari
Moderator
Moderator
Moderator
750 replies posted 500 replies posted 250 solutions authored

Hello RARA_2227736

According to the specification provided, CY8C4024LQI-S413https://www.cypress.com/search/psg/1297 would be suitable. It has 34 GPIO (anmy GPIO can be configured as CapSense), 2 SCB blocks (For I2C) and 5 TCPWM for timers.

You can also refer Product selector Guide for choosing the right part for you application.

Thanks and regards

Harigovind

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4 Replies
Hari
Moderator
Moderator
Moderator
750 replies posted 500 replies posted 250 solutions authored

Hello RARA_2227736

According to the specification provided, CY8C4024LQI-S413https://www.cypress.com/search/psg/1297 would be suitable. It has 34 GPIO (anmy GPIO can be configured as CapSense), 2 SCB blocks (For I2C) and 5 TCPWM for timers.

You can also refer Product selector Guide for choosing the right part for you application.

Thanks and regards

Harigovind

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Hello AH_96,

Thanks for your selection.

This chip absolute max gpio current is 200ma. I am going to use 10 LED (7 seg + 3 LED ). Each LED 10 mA drive current. And Each GPIO current is 25 mA max . is it Ok to operate LED direct drive without any buffer or I need to use buffer.

Thank you

Regards,

Rajakumar.R

Research and Development

Preethi Kitchen Appliances Pvt Ltd

Futura Tech Park, Q4, 4th Floor, Block B

#334, OMR, Sholinganallur, Chennai - 600 119

Mobile phone: +91-9500082969

E-mail: <mailto:Rajakumar.r@preethi.in> Rajakumar.r@preethi.in

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RARA_2227736
Level 2
Level 2

Hello AH_96,

Thanks for your selection.

This chip absolute max gpio current is 200ma. I am going to use 10 LED (7 seg + 3 LED ). Each LED 10 mA drive current. And Each GPIO current is 25 mA max . is it Ok to operate LED direct drive without any buffer or I need to use buffer.

Thank you

  Regards,
Rajakumar.R

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Hari
Moderator
Moderator
Moderator
750 replies posted 500 replies posted 250 solutions authored

Hello RARA_2227736

Since the GPIO is rated for a maximum of 25mA, it is safe to operate the LEDs on the GPIO. However, the voltage level will be maintained at VDDD-0.6 V when the current is 4mA. Hence the circuit must make sure that the output voltage is sufficient to turn ON the LED with required brightness.

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Thanks and regards

Hari

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