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CAT9954HV4I-T2 Datasheet(PDF) 9 Page - Catalyst Semiconductor |
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CAT9954HV4I-T2 Datasheet(HTML) 9 Page - Catalyst Semiconductor |
9 / 16 page CAT9554, CAT9554A 9 Doc. No. 25088, Rev. B © 2006 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice Figure 8. Acknowledge Timing Acknowledge After a successful data transfer, each receiving device is required to generate an acknowledge. The acknowledging device pulls down the SDA line during the ninth clock cycle, signaling that it received the 8 bits of data. The SDA line remains stable LOW during the HIGH period of the acknowledge related clock pulse (Figure 5). The CAT9554/9554A respond with an acknowledge after receiving a START condition and its slave address. If the device has been selected along with a write operation, it responds with an acknowledge after receiving each 8-bit byte. When the CAT9554/9554A begins a READ mode it transmits 8 bits of data, releases the SDA line, and monitors the line for an acknowledge. Once it receives this acknowledge, the CAT9554/9554A will continue to transmit data. If no acknowledge is sent by the Master, the device terminates data transmission and waits for a STOP condition. The master must then issue a STOP condition to return the CAT9554/9554A to the standby power mode and place the device in a known state. Registers and Bus Transactions The CAT9554/9554A consist of an input port register, an output port register, a polarity inversion register and a configuration register. Table 1 shows the register address table. Tables 2 to 5 list Register 0 through Register 3 information. The command byte is the first byte to follow the device address byte during a write/read bus transaction. The register command byte acts as a pointer to determine which register will be written or read. The input port register is a read only port. It reflects the incoming logic levels of the I/O pins, regardless of whether the pin is defined as an input or an output by the configuration register. Writes to the input port register are ignored. 18 9 START SCL FROM MASTER BUS RELEASE DELAY (TRANSMITTER) ACK DELAY ACK SETUP BUS RELEASE DELAY (RECEIVER) DATA OUTPUT FROM TRANSMITTER DATA OUTPUT FROM RECEIVER d n a m m o C ) x e h ( l o c o t o r Pn o i t c n u F 0 0 x 0e t y b d a e Rr e t s i g e r t r o p t u p n I 1 0 x 0e t y b e t i r w / d a e Rr e t s i g e r t r o p t u p t u O 2 0 x 0e t y b e t i r w / d a e Rr e t s i g e r n o i s r e v n i y t i r a l o P 3 0 x 0e t y b e t i r w / d a e Rr e t s i g e r n o i t a r u g i f n o C Table 1. Register Command Byte Table 3. Register 1 – Output Port Register t i b 7 I6 I5 I4 I3 I2 I1 I0 I t l u a f e d 1111 1 1 1 1 t i b 7 O6 O5 O4 O3 O2 O1 O0 O t l u a f e d 1111 1 1 1 1 Table 2. Register 0 – Input Port Register Table 4. Register 2 – Polarity Inversion Register t i b 7 N6 N5 N4 N3 N2 N1 N0 N t l u a f e d 0000 0 0 0 0 Table 5. Register 3 – Configuration Register t i b 7 C6 C5 C4 C3 C2 C1 C0 C t l u a f e d 1111 1 1 1 1 |
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Similar Description - CAT9954HV4I-T2 |
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