Recently, my company purchased some MC9S08SG32E1WTL chips from Mouser
electronics(a distributor of Freescale). In the production testing stage, all
products(about 100 sets) standby current are found to exceed the standard. The
measured current is up to 40~90uA, which is ~10uA before. When I repalce the
MCU chip to the same type one (previous purchased ),the whole measured current
is down to 10uA. My products is powered by a Lithium battery.Standby current
is a key indicator .
What causes this problem? And how to solve this problem?
Here some informations about MC9S08SG32E1WTL running:
1, standby mode:STOP3
2, in stop mode, internal clock disabled, external clock enabled
3, using external crystal 32.768KHz, bus clock 2.09MHz
4, LVD disabled