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COP888EB Datasheet, PDF (9/75 Pages) National Semiconductor (TI) – 8-Bit CMOS ROM Based Microcontrollers with 8k Memory, CAN Interface, 8-Bit A/D, and USART
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CAN Comparator DC and AC Characteristics
4.8V ≤ VCC ≤ 5.2V, −40˚C ≤ TA ≤ +125˚C
Parameter
Conditions
Min
Typ
Differential Input Voltage
Input Offset Voltage
Input Common Mode
1.5V < VIN < VCC −1.5V
1.5
Voltage Range
Input Hysteresis
8
Max
±25
±10
VCC −1.5
Units
mV
mV
V
mV
A/D Converter Specifications
(4.5V ≤ VCC ≤ 5.5V) (VSS − 0.050V) ≤ Any Input ≤ (VCC + 0.050V)
Parameter
Conditions
Min
Typ
Resolution
Absolute Accuracy
Non-Linearity
VREF = VCC
Deviation from the Best Straight Line
Differential Non-Linearity
Common Mode Input Range (Note 24)
GND
DC Common Mode Error
Off Channel Leakage Current
1
On Channel Leakage Current
1
A/D Clock Frequency (Note 23)
0.1
Conversion Time (Note 22)
17
Internal Reference Resistance Turn-On Time (Note 25)
Max
8
±2
±1
±1
VCC
±0.5
2.0
2.0
1.67
1
Units
Bits
LSB
LSB
LSB
V
LSB
µA
µA
MHz
A/D Clock Cycles
µs
Note 22: Conversion Time includes sample and hold time.
Note 23: See Prescaler description.
Note 24: For VIN(−) > = VIN(+) the digital output code will be 0000 0000. Two on-chip doides are ties to each analog input. The diodes will forward conduct for analog
input voltages below ground or above the VCC supply. Be careful, during testing at low VCC levels (4.5V), as high level analog inputs (5V) can cause this input diode
to conduct — especially at elevated temperatures, and cause errors for analog inputs near full-scale. The spec allows 50 mV forward bias of either diode. This means
that as long as the analog VIN does not exceed the supply voltage by more than 50 mV, the output code will be correct. To achieve an absolute 0 VDC to 5 VDC input
voltage range will therefore require a minimum supply voltage of 4.950 VDC over temperature variations, initial tolerance and loading.
Note 25: Time for internal reference resistance to turn on after coming out of Halt or Idle Mode.
DS012837-4
FIGURE 3. MICROWIRE/PLUS Timing Diagram
9
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