SL900A-ASWB datasheet(63/90 Pages) AMSCO

63 / 90 page

ams Datasheet: 2014-May-06 [v1-01]

SL900A – 63

Ca l i b r at i o n B i t s

The SL900A chip is factory calibrated. The calibration settings

can be modified by the application. Some values in the

calibration data field should not be modified by the application

as this could degrade the temperature performance and the

communication stability. Those values are highlighted in the

table as DO NOT MODIFY.

The individual bits in the calibration field are:

Calibration

Function

Range

Min

Max

Step

ad1[4:0]

AD lower voltage reference - fine – DO NOT

MODIFY

-10mV

+10mV

0.625mV

coars1[2:0]

AD lower voltage reference - coarse – can be

used

160mV

510mV

50mV

ad2[4:0]

AD higher voltage reference - fine – DO NOT

MODIFY

-10mV

+10mV

0.625mV

coars2[2:0]

AD higher voltage reference - coarse

260mV

610mV

50mV

gnd_switch

Switches the lower AD voltage reference to

ground (default = 1)

selp12[1:0]

POR voltage level for 1.5V system

LH -1.04V

HL -0.98V

LH - 1.17V

HL - 1.11V

adf[4:0]

Main reference voltage calibration – DO NOT

MODIFY

622mV

648mV

0.86mV

df[7:0]

RTC oscillator calibration

800Hz

1165Hz

~1Hz

(non linear)

sw_ext_en

Controlled battery supply for external sensor –

the battery voltage is connected to the EXC pin

selp22[1:0]

POR voltage level for 3V system

LH - 1.95 V

HL - 1.84V

LH - 2.19V

HL - 2.07V

Calibration Bits

SL900A-ASWB Datasheet(PDF) 63 Page - ams AG

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