QST108 datasheet(48/51 Pages) STMICROELECTRONICS

48 / 51 page

Device revision information

QST108

48/51

9.2.2

Revision 2.3

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When the device enters Low Power mode, an additional sleep time is inserted after

each burst, instead of once after every complete burst cycle. As a result, if only one

burst is required, the sleep duration during Low Power mode is doubled. And if two

bursts are required, the sleep duration is tripled.

In Standalone mode, the 100ms sleep duration low power becomes either a 200ms or

300ms sleep duration depending on the number of bursts required.

In I2C mode, it is required to program a sleep duration for one half or a third of the

desired sleep duration depending on the number of bursts required.

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GET_PROTOCOL_VERSION returns 0x01 as I2CSpeed byte when it should return

0x00 (maximum speed is 100 kHz).

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If a command is sent with an incorrect parity bit, the device reports an unsupported

command instead of a parity error.

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In I2C mode, it is recommended to set the fast positive recalibration threshold to 5

using the SET_SCKEY_PARAMETERS command in order to ensure a reliable

behavior on low sensitivity keys.

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AKS should be always enabled in BCD mode. The AKS pull-up option resistor should

be connected to pin KOUT2.

QST108 Datasheet(PDF) 48 Page - STMicroelectronics