TC1775 Datasheet, PDF (79/101 Pages) Infineon Technologies AG – 32-Bit Single-Chip Microcontroller

TC1775
Preliminary
10) _{The overload coupling factor (kA) defines the worst case relation of an overload condition (IOV) at one pin to}
the resulting leakage current (I_leak) into an adjacent pin: |I_leak| = k_A × |I_OV|.
Thus under overload conditions an additional error leakage voltage (U_AEL) will be induced onto an adjacent
analog input pin due to the resistance of the analog input source (R_AIN). That means U_AEL = R_AIN × |I_leak|.
See also section 7.1.6 “Error Through Overload Conditions” in the TC1775 Peripheral Units User’s Manual for
further explanations.
11) _{This represents an equivalent switched capacitance. This capacitance is not switched to the reference voltage}
at once. Instead of this smaller capacitances are successively switched to the reference voltage. Alternatively,
the redistributed charge could be specified.
12) _{The switched capacitance at the analog voltage input must be charged within the sampling time. Alternatively,}
the redistributed charge could be specified.
R _{AIN, Source}
V _AIN =
C _{AIN, Block}
R _{AIN, On}
A/D Converter
C _AINTOT - C _AINSW
C _AINSW
MCS04879
Figure 24 Equivalent Circuitry of Analog Input
Note: This equivalent circuitry for an analog input is also valid for the reference inputs
V_AREF and V_AGND.
Data Sheet
75
V1.2, 2002-05