UM10501
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© NXP B.V. 2011. All rights reserved.
User manual
Rev. 2 — 16 November 2011
12 of 18
NXP Semiconductors
UM10501
SSL21083 reference board user manual
10. Known issues
10.1 Latch up on fast mains toggle
It can be observed that the board latches up when the mains voltage is switched on, off,
and then on again within a 1.6 s time period.
The cause of this is a crossing of the ground trace between buffer capacitor C1 and
source resistors R5/R6. This causes a spike between the IC source and GND greater than
1.5 V. This in-turn activates SWP.
To overcome this problem, a modification can be implemented. Connect a wire bridge
between R5/R6, GND and the IC GND pin to bypass the crossed traces and reduce
switch on spike. See
for a pictorial view of the modification.
Fig 11. Board modification