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ZSSC1856 Datasheet, PDF (62/179 Pages) List of Unclassifed Manufacturers – Intelligent Battery Sensor IC
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ZSSC1856
Intelligent Battery Sensor IC
3.8.2 ADC Data Path
Figure 3.18 Functional Block Diagram of the Digital ADC Data Path
SDM 1
SDM 2
{000, BIST bitstream}
{000, BIST bitstream}
4
4
Bitstream
CapBtiutsretream
Capture
Noise
CancellNaotiiosne
4
Cancellation
4
sinc4
Decimastiinocn4
FDiletecrimation
Filter
Post Filter
Post Filter
Data Post
Correction
Result Register
The incoming 2nd and 3rd order bit streams from the analog part of the SD-ADCs are first captured and then driven
through a 3rd order noise shaping filter. The digital conversion is accomplished by a 4th order low-pass filter (sinc4
decimation filter). The bit stream capturing and the noise shaping filter cannot be directly changed by the user (no
configuration registers), but the selected oversampling rate (register field osr) affects the sinc4 decimation filter
(one output value per N input values).
A simple post filter (moving average filter) is placed behind the sinc4 decimation filter. The user can select the
averaging function (no averaging; 2-stage averaging; 3-stage averaging) when chopping is disabled. When
chopping is enabled, the 2-stage averaging is used independently of the filter configuration.
The function of the 2-stage averaging filter is
x out
(t)

xin(t)  xin(t
2
 1)
(9)
The function of the 3-stage averaging filter is
xout (t)

xin(t) 
2*
xin(t  1) 
4
xin(t

2)
(10)
Data Sheet
April 24, 2012
© 2012 Zentrum Mikroelektronik Dresden AG — Rev.1.00
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
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