Rainbow-electronics AT73C246 Manual do Utilizador descarregar pdf (Página 21)

11050A–PMAAC–07-Apr-10

AT73C246

9.10 RTC Crystal Oscillator

Note: 1. Current consumption in V

BACKUP

with crystal. In case of crystal not present on-board, back-up batteries or supercapacitors,

must be avoided.

9.11 Die Temperature Sensor

Table 9-11. RTC Crystal Oscillator Electrical Characteristics

Symbol Parameter Comments Min Typ Max Units

Operating Supply Voltage V

BACKUP

1.75 2.5 2.65 V

Freq Frequency with crystal - 32.768 - kHz

Duty Duty Cycle 40 50 60 %

Supply Current

(1)

OFF - - 5 nA

ON - - 1.5 µA

Startup Time C

= 12pF - 1000 1500 ms

XIN

Level Sinus Wave on XIN 250 300 mVpp

XOUT

Vpp On XOUT 300 mVpp

Internal Resistor between xin and xout 10 MΩ

Drift Accuracy @25°C, +/- 20ppm 1.5 mn/month

Esr Equivalent Series Resistance Rs Crystal @ 32.768kHz 50 100 kΩ

Motional Capacitance Crystal @ 32.768kHz 0.6 3 fF

SHUNT

Shunt Capacitance Crystal @ 32.768kHz 0.6 2 pF

LOAD

Load Capacitance Crystal @ 32.768kHz 6 12.5 pF

Table 9-12. Die Temperature Sensor Electrical Characteristics

Symbol Parameter Comments Min Typ Max Units

SHUTDOWN

130°C Shutdown Threshold 135 145 155 °C

RESTART

110°C Restart Threshold 105 115 125 °C

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 158 159

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