S912XHY128F0VLM Datasheet, PDF (732/802 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

Electrical Characteristics
is recommended to configure PortAD pins as outputs only for low frequency, low load outputs. The impact
on ATD accuracy is load dependent and not specified. The values specified are valid under condition that
no PortAD output drivers switch during conversion.
A.2.2.2 Source Resistance
Due to the input pin leakage current as specified in Table A-7 and Table A-6 in conjunction with the source
resistance there will be a voltage drop from the signal source to the ATD input. The maximum source
resistance R_S specifies results in an error (10-bit resolution) of less than 1/2 LSB (2.5 mV) at the maximum
leakage current. If device or operating conditions are less than worst case or leakage-induced error is
acceptable, larger values of source resistance of up to 10Kohm are allowed.
A.2.2.3 Source Capacitance
When sampling an additional internal capacitor is switched to the input. This can cause a voltage drop due
to charge sharing with the external and the pin capacitance. For a maximum sampling error of the input
voltage ≤ 1LSB (10-bit resilution), then the external filter capacitor, C_f ≥ 1024 * (C_INS–C_INN).
A.2.2.4 Current Injection
There are two cases to consider.
1. A current is injected into the channel being converted. The channel being stressed has conversion
values of $3FF (in 10-bit mode) for analog inputs greater than V_RH and $000 for values less than
V_RL unless the current is higher than specified as disruptive condition.
2. Current is injected into pins in the neighborhood of the channel being converted. A portion of this
current is picked up by the channel (coupling ratio K), This additional current impacts the accuracy
of the conversion depending on the source resistance.
The additional input voltage error on the converted channel can be calculated as:
V_ERR = K * R_S * I_INJ
with I_INJ being the sum of the currents injected into the two pins adjacent to the converted channel.
MC9S12XHY-Family Reference Manual, Rev. 1.01
732
Freescale Semiconductor