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doc: fix typo

usb_bug_detector
King Kévin 2022-06-27 14:33:03 +02:00
parent 11d0b83a0b
commit 909e6e1b58
1 changed files with 3 additions and 3 deletions
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README.md
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@ -35,7 +35,7 @@ only populate it to debug the board.
the READY LED will we on when the BUGGED LED isn't.
this allows to always check if the battery is empty, but this also drains the battery even when not testing because an LED is always on.
the first prototype of the board (v0) offers three populating options, depending on the available NOR gate part:
the first prototype of the board (v0) offers three populating options, depending on the available NOR gate part and package:
- 1x SOIC-14 package: U1+C1
- 2x SOT23-5 pachgae: U2+C2, U3+C3
@ -47,13 +47,13 @@ note: the Cx decoupling capacitor is not really necessary and is just present fo
mode of operation
=================
and NOR-gate-based SR-latch is used.
an NOR-gate-based SR-latch is used.
the RESET button triggers the R signal to reset the latch.
when a USB cable is plugged, power is provided by the battery to the cable.
if an integrated circuits is present, current will flow through.
a 1 k Ohm resistor on the low side (e.g. ground) will create a voltage.
if the plug draws more than 1.6 mA, the resulting 1.6 V will trigger the S signal to set the latch.
the BUG LED will indicate the send SR-latch is set.
the BUG LED will indicate when the SR-latch is set.
the latch remains set until the RESET button is present.
thus, even if the plug stops drawing power, the LED remains on.