Help! MC9S08SG32E1WTL standby current exceeds the manual value

[chinagdszweizhe]

Hi everyone

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?

Thanks

Wei

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

[vicentegomez]

Hi Wei

Are you using all the pins?

In some times the pins that are not using are floating, and this can cause some power consumption.

Please set all the pin to a know state.

Please check the application note AN4441​ for more information.

Regards

Vicente Gomez