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@ -25,20 +25,21 @@ Mount:
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U10 FLASH: IS25LP032D-JNLE-TR SOIC-8 150mil
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U9 WIFI: ESP32, but not all pins! read below:
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Don't connect ESP32 pins leading to SD card
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those are 6 central pins from on the top 10-pin row of
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ESP32 chip (only 2 pins on left side and 2 pins on right
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side shuould be connected). Either cut the traces or carefully
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solder without touching SD card pins.
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Don't connect ESP32 pins leading to SD card,
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in the top 10-pin row, connect only 2 pins on left side and 2 pins on right
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and leave 6 central pins unconnected. GND and VCC
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can be connected, but no other SD signal pins.
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Either cut the traces or carefully solder without
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touching those pads.
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# What is fixed
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Shutdown:
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on assembled PCB v1.7, D11=1N4148 and R4=15k will
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keep waking the board up after shutdown signal because FT231x internal
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PCB v1.7 assembled comes with D11=1N4148 and R4=15k, those will
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keep waking up the board after shutdown signal because FT231x internal
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regulator will provide enough voltage (cca 2.5V will appear at 3.3V line)
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and that is enough to wakeup the board because voltage
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and that is enough to wake up the board because voltage
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on ENABLE pin at switching regulators will be above its turn on
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threshold of 1.5V.
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@ -50,23 +51,22 @@ self-hold switching regulator during normal operation and at controlled
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shutdown signal, it will drop below turn-off threshold, allowing reliable
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shutdown.
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Software shutdown is not routed to BGA pads so alternative patch is
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to connect any GPIO (we recommend "25-") to SHUTDOWN.
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Software shutdown is not routed to BGA pads. It is possible to connect
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any GPIO (we recommend "25-") to SHUTDOWN.
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I2C:
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Too low pull up resistors (470 ohm) are at 5V side of the level converter PCA9306
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and some monitors won't tolerate that. Data traffic at i2c will be
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errorneously received by some monitors and some serious problem may arrise
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if monitor interprets some data garbage as random write command, overwriting
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its internal settings, then monitor will become useless.
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Correct pull up resistors are 4.7k and they work properly.
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and some monitors will receive niose with that. If data traffic at i2c is
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not received 100% error-free, some monitors will get into serious problems.
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When monitor interprets some data garbage as random write command and
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overwrites its internal settings, such monitor might become premanently
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useless. Correct pull up resistors are 4.7k and they should work properly.
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WIFI:
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On PCB v1.7, SD card is connected to ESP32 pins that are widely advertised
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as SD card pins, but the problem is those pins are shared with internal flash
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chip and ESP32 won't boot from its SPI FLASH if anything is connected there.
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SD card should be connected on some other pins, probably HSPI. It has not
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yet been verified will that work.
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On PCB v1.7 SD card is connected to those ESP32 pins which are widely advertised
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as SD card pins, but those pins are shared with internal SPI FLASH of ESP32
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chip it won't boot if anything is connected there.
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SD card should be connected on some other pins, probably HSPI.
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It has not yet been verified will it work, so no patch recommendation yet.
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davor
7 years ago