 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
MRF24J40 Datasheet(PDF) 10 Page - Microchip Technology |
|
||||||||||||||||||||||||||||||
MRF24J40 Datasheet(HTML) 10 Page - Microchip Technology |
|
|
10 / 152 page  MRF24J40 DS39776B-page 8 Preliminary © 2008 Microchip Technology Inc. 2.4 Power and Ground Pins Recommended bypass capacitors are listed in Table 2-2. VDD pins 1 and 31 require two bypass capacitors to ensure sufficient bypass decoupling. Min- imize trace length from the VDD pin to the bypass capacitors and make them as short as possible. TABLE 2-2: RECOMMENDED BYPASS CAPACITOR VALUES 2.5 20 MHz Main Oscillator The 20 MHz main oscillator provides the main frequency (MAINCLK) signal to internal RF, baseband and MAC circuitry. An external 20 MHz quartz crystal is connected to the OSC1 and OSC2 pins as shown in Figure 2-2. The crystal parameters are listed in Table 2-3. TABLE 2-3: 20 MHz CRYSTAL PARAMETERS(1) FIGURE 2-2: 20 MHz MAIN OSCILLATOR CRYSTAL CIRCUIT 2.6 Phase Lock Loop The Phase Lock Loop (PLL) circuitry requires one external capacitor connected to pin 40 (LCAP). The recommended value is 100 pF. The PCB layout around the capacitor and pin 40 should be designed carefully such as to minimize interference to the PLL. 2.7 32 kHz External Crystal Oscillator The 32 kHz external crystal oscillator provides one of two Sleep clock (SLPCLK) frequencies to Sleep mode counters. The Sleep mode counters time the Beacon Interval (BI) and inactive period for a beacon-enabled device and the Sleep interval for a nonbeacon-enabled device. Refer to Section 3.15 “Sleep” for more information. The SLPCLK frequency is selectable between the 32 kHz external crystal oscillator or 100 kHz internal oscil- lator. The 32 kHz external crystal oscillator provides better frequency accuracy and stability than the 100 kHz internal oscillator. An external 32 kHz tuning fork crystal is connected to the LPOSC1 and LPOSC2 pins, as shown in Figure 2-3. The crystal parameters are listed in Table 2-4. TABLE 2-4: 32 kHz CRYSTAL PARAMETERS(1) VDD Pin Bypass Capacitor 1 47 pF and 0.01 μF 447 pF 50.1 μF 21 0.01 μF 31 47 pF and 0.01 μF 32 47 pF 35 47 pF 37 0.01 μF 39 1 μF Parameter Value Frequency 20 MHz Frequency Tolerance at 25°C ±20 ppm(2) Frequency Stability over Operating Temperature Range ±20 ppm(2) Mode Fundamental Load Capacitance 15-20 pF ESR 80 Ω max. Note 1: These values are for design guidance only. 2: IEEE 802.15.4™ Standard specifies transmitted center frequency tolerance shall be ±40 ppm maximum. Parameter Value Frequency 32.768 kHz Frequency Tolerance ±20 ppm Load Capacitance 12.5 pF ESR 70 k Ω max. Note 1: These values are for design guidance only. OSC1 OSC2 20 MHz Main Oscillator X1 CL2 CL1 |
Similar Part No. - MRF24J40 |
|
Similar Description - MRF24J40 |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
