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ICS94206 Datasheet(PDF) 4 Page - Integrated Circuit Systems |
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ICS94206 Datasheet(HTML) 4 Page - Integrated Circuit Systems |
4 / 18 page 4 ICS94206 1. The ICS clock generator is a slave/receiver, I 2C component. It can read back the data stored in the latches for verification. Readback will support standard SMBUS controller protocol. The number of bytes to readback is defined by writing to byte 8. 2. When writing to byte 11 - 12, and byte 13 - 14, they must be written as a set. If for example, only byte 14 is written but not 15, neither byte 14 or 15 will load into the receiver. 3. The data transfer rate supported by this clock generator is 100K bits/sec or less (standard mode) 4. The input is operating at 3.3V logic levels. 5. The data byte format is 8 bit bytes. 6. To simplify the clock generator I 2C interface, the protocol is set to use only Block-Writes from the controller. The bytes must be accessed in sequential order from lowest to highest byte with the ability to stop after any complete byte has been transferred. The Command code and Byte count shown above must be sent, but the data is ignored for those two bytes. The data is loaded until a Stop sequence is issued. 7. At power-on, all registers are set to a default condition, as shown. Notes: Brief I 2C registers description for ICS94206 Programmable System Frequency Generator Register N ame Byte Description PWD Default Functionality & Frequency Select Register 0 Output frequency, hardware / I 2 C frequency select, spread spectrum & output enable control register. See individual byte description Output Control Registers 1-6 Active / inactive output control registers/latch inputs read back. See individual byte description Vendor ID & Revision ID Registers 7 Byte 11 bit[7:4] is ICS vendor id - 1001. Other bits in this register designate device revision ID of this part. See individual byte description Byte Count Read Back Register 8 Writing to this register will configure byte count and how many byte w ill be read back. Do not write 00H to this byte. 08H Watchdog Timer Count Register 9 Writing to this register will configure the number of seconds for the watchdog timer to reset. 10H Watchdog Control Registers 10 Bit [6:0] Watchdog enable, watchdog status and programmable 'safe' frequency' can be configured in this register. 000,0000 VCO Control Selection Bit 10 Bit [7] This bit select w hether the output frequency is control by hardware/byte 0 configurations or byte 11&12 programming. 0 VCO Frequency Control Registers 11-12 These registers control the dividers ratio into the phase detector and thus control the V CO output frequency. Depended on hardware/byte 0 configuration Spread Spectrum Control Registers 13-14 These registers control the spread percentage amount. Depended on hardware/byte 0 configuration Group Skews Control Registers 15-16 Increment or decrement the group skew amount as compared to the initial skew . See individual byte description Output Rise/Fall Time Select Registers 17-20 These registers will control the output rise and fall time. See individual byte description |
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