Rainbow-electronics AT89C5132 Manual de usuario descargar pdf (Pagina 139)

139

AT8xC5132

4173A–8051–08/02

A-to-D Converter Table 125. A-to-D Converter DC Characteristics V

= 2.7 to 3.3V , TA = -40°C to

+85°C

Oscillator and Crystal

Schematic Figure 116. Crystal Connection

Note: For operation with most standard crystals, no external components are needed on X1

and X2. It may be necessary to add external capacitors on X1 and X2 to ground in spe-

cial cases (max 10 pF). X1 and X2 may not be used to drive other circuits.

Parameters Table 126. Oscillator and Crystal Characteristics V

= 2.7 to 3.3V , TA = -40° to +85°C

Symbol Parameter Min Typ Max Units Test Conditions

Analog Supply Voltage 2.7 3.3 V

Analog Operating Supply

Current

600 µA

= 3.3V

AIN1:0 = 0 to AV

Analog Standby Current 2 µA

= 3.3V

ADEN = 0 or PD = 1

Analog Input Voltage AV

REF

Reference Voltage

REFN

REFP

2.4 AV

REF

AREF Input Resistance 10 30 kΩ T

= 25°C

Analog Input capacitance 10 pF T

= 25°C

Symbol Parameter Min Typ Max Unit

Internal Capacitance (X1 - V

)10pF

Internal Capacitance (X2 - V

)10pF

Equivalent Load Capacitance (X1 - X2) 5 pF

DL Drive Level 50 µW

F Crystal Frequency 20 MHz

RS Crystal Series Resistance 40 Ω

CS Crystal Shunt Capacitance 6 pF

1 2 ... 134 135 136 137 138 139 140 141 142 143 144 ... 161 162

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