Other Parts Discussed in Thread: SN74AUC1G17, SN74AXC8T245
Hi Sir,
Would you please help to recommend a level shift IC have 2 chip select pin to switch 2 pcs SPI ECG sensor?
Thank you.
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Hi Sir,
Would you please help to recommend a level shift IC have 2 chip select pin to switch 2 pcs SPI ECG sensor?
Thank you.
Hi
The voltage of MCU I/O is 1.8V , sensor I/O is 3.3V.
Do you recommand 6 or 8 channel level shift IC ?
Thanks.
You need to shift four signals up and one signal down. This can be done with an eight-channel device like the SN74AXC8T245, or with a four-channel device like the SN74AXCT4T245 for upshifting plus a buffer with overvoltage-tolerant input like the SN74AUC1G17 for downshifting.
(The MISO outputs of the sensors are high impedance when idle, so you can simply connect them together.)