Other Parts Discussed in Thread: MSP430G2231
Hi,
I am using the MSP430G2231 and I am experiencing a wide range of current usage among several PCBs I have placed these processors on. Using the same circuitry and code, I get 1-3uA of current usage on some boards (which is expected), while others use 20-60uA. This is a power sensitive application, so it is necessary to have the lower value on all boards. Any advice on what can cause this sort of issue would be a great help.
The circuitry is such: VCC to a 3V battery with 10uF and 100nF capacitors to ground. VSS to ground. P1.0, 1.3, 1.5 disconnected. TXD, RXD , RST, and TEST to a programming header. RST also has a 47.5k pull-up resistor and 1nF capacitor to ground. XIN and XOUT are connected to a 32k crystal (same as on the demo board), though 0 ohm resistors and with 12pF capacitors to ground. P1.6 and P1.7 are being used as I2C lines. During the current usage testing, the I2C lines are disconnected.
The code on the processor is set to be used as an i2C RTC, explained in http://e2e.ti.com/support/microcontrollers/msp43016-bit_ultra-low_power_mcus/f/166/p/134929/485133.aspx which addresses another issue I am having.
Thanks!
