diff --git a/README.md b/README.md index 8c56c4c3ab32864af82afcfb2c387582be09d805..88e4e97ce506f0981dd3e95773ed64033c45786b 100644 --- a/README.md +++ b/README.md @@ -1,8 +1,19 @@ # PCB for current/power measurement of MSP430FR5994 - + Modified design from TI's MSP430FR5994 Launchpad - + removed emulation unit, power supply etc - + added current sense amplifier (Gain: 200, BW: 100 kHz) between mcu and main decoupling capacitor - + added load switch that turns controls supply to mcu - + decoupled mcu from main VCC - + reduced layout from 4 to 2 layers +This is a simple 2 layer PCB made for high frequency ($\approx100\ kHz$) current measurement of the MSP430FR6994 microcontroller. +The main purpose is to measure current going between the MCU and its decoupling capacitance, with high enough bandwidth to capture behaviour on an intermittent supply. + +The board does not currently include supply voltage supervision circuitry to turn on and off the included load switch (that controlls the MUC's supply voltage). +The load switch therefore has to be controlled by an external circuit, or connected via a jumper such that it's always on. + +The board was based on the TI's MSP430FR5994 Launchpad board, with the folowing changes: + + + removed emulation unit, power supply etc + + added current sense amplifier (Gain: 200, BW: 100 kHz) between mcu and main decoupling capacitor + + added load switch that turns controls supply to mcu + + decoupled mcu from main VCC + + reduced layout from 4 to 2 layers + +# Schematic and layout + +