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MB91F613 Datasheet(PDF) 90 Page - fujitsu semiconductor

Part # MB91F613
Description  32-bit Microcontrollers
PDF  104 Pages
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Manufacturer  FUJITSU [fujitsu semiconductor]
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Logo FUJITSU - fujitsu semiconductor

MB91F613 Datasheet(HTML) 90 Page - fujitsu semiconductor

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MB91610 Series
90
DS07-16907-2E
(Continued)
*2 : The current when the CPU is in stop mode and the A/D converter is not operating.
*3 : Compare time = {(CT
+ 1) × 10 + 4} × peripheral clock (PCLK) period. (CT indicates compare time setting bits.)
The condition of the minimum compare time is when CT
= 1 and PCLK = 33 MHz.
The output impedance of the external circuit connected to the analog input affects the sampling time of the A/D
converter. Design the output impedance of the output circuit such that the required sampling time is less than the
value of TS calculated from the following equation.
(Equation 1) Ts
= (Rin + Rext) × Cin × 8
Ts
: Sampling time
Rin
: Input resistance of A/D
= 5.3 kΩ
Cin
: Input capacitance of A/D
= 8.5 pF
Rext
: Output impedance of external circuit
If the sampling time is set as 600 ns,
600 ns
≥ (5.3 kΩ + Rext) × 8.5 pF × 8
∴Rext ≤ 3.5 kΩ
And the impedance of the external circuit therefore needs to be 3.5 k
Ω or less.
Rin
Cin
Rext
Analog
signal source
Comparator
Rin
Cin
Approx. 5.3 k
Ω
Approx. 8.5 pF
AN0 to AN7
Analog input pin



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