MCS11 datasheet(59/108 Pages) PADAUK

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MCS11

ADC-Type Enhanced FPPA

TM Controller

Page 59 of 108

PDK-DS-MCS11_v020 – Apr. 20, 2018

5-21-2. Analog Inputs

A simplified circuit for the analog inputs is shown in the Fig. 5-21-2. All the analog input pins for general

purpose comparator are shared function with a digital input which had reverse biased ESD protection

diodes to VDD and GND, therefore, the analog input signal must be between VDD and GND.

VAI

RS＜10K

VDD

RIC~1K

↓

ILeakage

~ ±400nA

VT ~ 0.7V

VT ~ 0.7v

Analog Input Pad

Comparator

Input

Where:

VAI: Voltage of Analog Input

RS: Source Impedance

CPIN: Pin Input Capacitance

RIC: Interconnect Resistance

ILeakage: Leakage Current at Pin

VT: Threshold Voltage

CPIN

~ 4pF

Fig. 5-21-2 Analog Input Model of General Purpose Comparator

5-21-3. Internal reference voltage (Vinternal R)

The internal reference voltage Vinternal R is built by series resistance to provide different level of reference

voltage, bit 4 and bit 5 of gpcs register are used to select the maximum and minimum values of Vinternal R

and bit [3:0] of gpcs register are used to select one of the voltage level which is deivided-by-16 from the

defined maximum level to minimum level. Fig. 5-21-3 to Fig. 5-21-6 shows four conditions to have

different reference voltage Vinternal R. By setting the gpcs register, the internal reference voltage Vinternal R

can be ranged from (1/32)*VDD to (3/4)*VDD.

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