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MAX6620 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX6620 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 30 page MAX6620 Quad Linear Fan-Speed Controller 10 Maxim Integrated Slave Address A master initiates communication with a slave device by issuing a START condition followed by a slave address byte. As shown in Figure 5, the slave address byte con- sists of 7 address bits and a read/write bit (R/W). When idle, the MAX6620 continuously waits for a START con- dition followed by its slave address. The first four bits (MSBs) of the slave address have been factory pro- grammed and are always 0101 and the seventh bit is 0. Connect ADDR to GND or VCC, or leave it unconnected to program D2 and D1 of the slave address according to Table 1. After receiving the address, the MAX6620 (slave) issues an acknowledgement by pulling SDA low for one clock cycle. Data Byte (Read and Write) Single Read and Burst Read. A single read begins with the bus master issuing a START condition followed by the seven slave ID address bits and a zero (WR, Figure 2), which is followed by an acknowledge bit (A) from the slave corresponding to the slave ID. Next, the master sends out an 8-bit register address, which is also followed by an acknowledge bit from the slave. The bus master issues another START condition and the same seven slave ID address bits followed by a one (RD, Figure 2), with the slave producing an acknowl- edge bit. The slave then sends out the 8-bit data corre- sponding to the register address previously written by the master. The bus master sends back a not-acknowl- edge bit (A). This completes the single read process and a STOP condition is issued by the bus master. In a burst read, the process is the same as a single read except that the bus master issues an acknowl- edge bit after each byte transmitted by the slave. After each acknowledge bit, the register address increments by one, and the data from the next register is transmit- ted by the slave. The process continues, with data reads followed by acknowledges. After the register with the highest address is read, the register pointer rolls over to point to the first register. To terminate a burst read, the bus master issues a STOP condition. Single Write and Burst Write. A single write begins with the bus master issuing a START condition followed by the seven slave ID address bits and a zero (WR, Figure 2), which is followed by an acknowledge bit (A) from the slave corresponding to the slave ID. Next, the master sends out an 8-bit register address, which is also followed by an acknowledge bit from the slave. After the acknowledge bit, 8-bit data is written to the register, and the slave issues a third acknowledgement. A STOP condition is issued by the bus master to com- plete the single write process. In a burst write, the process is similar to a single write except that the master does not issue a STOP condition immediately after the first byte has been written. After the first write is completed, the slave issues an acknowledge bit, the register address increments by one, and the data to be written to the next register is transmitted by the master. The process continues, with data writes followed by acknowledges. After the regis- ter with the highest available address is written, the reg- ister pointer rolls over to point to the first register. To terminate a burst write, the bus master issues a STOP condition. Fan Drive The MAX6620 uses external pass transistors to power the fans. DACOUT1–DACOUT4 adjust the power- supply voltage for each fan by driving the base of a PNP bipolar transistor, or the gate of a p-MOSFET. The resulting fan-supply voltage is fed back to DACFB_. This closes the voltage feedback loop. The system power supply for the output devices is VFAN. VFAN is SLAVE ADDRESS ADDR CONNECTION HEX BINARY GND 0x50 0101 000 Unconnected 0x52 0101 010 VCC 0x54 0101 100 Table 1. Slave Address Setting with ADDR Pin SDA SCL 01 0 1 1234 D2 D1 0 R/W 567 8 9 S A ACKNOWLEDGE Figure 5. MAX6620 Slave Address Byte |
Similar Part No. - MAX6620_13 |
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Similar Description - MAX6620_13 |
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