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L9678P Datasheet(PDF) 169 Page - STMicroelectronics

Part # L9678P
Description  Automotive user configurable airbag and battery cut-off IC
PDF  215 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9678P Datasheet(HTML) 169 Page - STMicroelectronics

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DS11626 Rev 9
169/216
L9678P, L9678P-S
System voltage diagnostics
214
applies to the case of a precise reference voltage: the spread of reference voltage causes a
proportional error in the conversion output. The reference voltage of the ADC is set to 2.5 V.
The conversion time is comprised of several factors: the number of measurements loaded
into the queue, the number of samples taken for any measurement, and the various settling
times. An example of conversion time calculation for a full ADC request queue is reported in
Figure 57. The timings reported in Figure 57 are nominal ones, min/max values can be
obtained by considering the internal oscillator frequency variation reported in the DC
characteristics section.
Figure 57. ADC conversion time
GAPGPS01655
IQ
Post
ADC
IQ
IQ
ADC
Pre-
DIAGCTRL_ A
S * T_SC
DIAGCTRL_B
S * T_SC
DIAGCTRL_C
S*T_SC
DIAGCTRL_D
S*T_SC
Post- ADC = Final ADC Settling Time = 3.44 μs
IQ = Intra- Queue Settling Time = 3.5 μs
T_ SC = Single Sample Conversion Time = 2.25 μs
S = # of Samples (default = 4 for voltage only measurements)
Pre- AD C = Initial ADC Settling Time = 4.81 μs



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