Atmel AT85DVK-07 Spezifikationen PDF herunterladen (Seite 242)

AT85C51SND3Bx

7632A–MP3–03/06

Oscillator & Crystal

Schematic Figure 134. 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).

Parameters Table 258. Oscillator & Crystal Characteristics

= 1.65 to 3.6 V; T

= -40 to +85°C

Notes: 1. Authorized crystal frequencies are 12, 16, 20 and 24 MHz

2. Authorised input frequencies are 12, 13, 16, 19.2, 19.5, 20, 24 and 26MHz

DC to DC Convertor

Schematic Figure 135. Battery DC-DC Connection

Notes: 1. Mandatory connection if DC-DC is used.

2. Depending on power supply scheme, C

DC1

may replace C

capacitor (see Figure

136

APVSS

Symbol Parameter Min Typ Max Unit

Internal Capacitance (X1 - VSS) 10 pF

Internal Capacitance (X2 - VSS) 10 pF

Equivalent Load Capacitance (X1 - X2) 5 pF

DL Drive Level 50 μW

F Crystal Frequency

(1)

12 24 MHz

RS Crystal Series Resistance 40 Ω

CS Crystal Shunt Capacitance 6 pF

LVDD

BVDD

BVSS

Battery

DCLI

DC1

(2)

VSS

RLVDD

CVSS

DC2

(1)

1 2 ... 237 238 239 240 241 242 243 244 245 246 247 ... 262 263

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