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MAX7501MUA Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX7501MUA Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 13 page Digital Temperature Sensors and Thermal Watchdog with Bus Lockup Protection _______________________________________________________________________________________ 5 I2C-Compatible Bus Interface From a software perspective, the MAX7500/MAX7501/ MAX7502 appear as a set of byte-wide registers that contain temperature data, alarm threshold values, and control bits. A standard I2C-compatible 2-wire serial interface reads temperature data and writes control bits and alarm threshold data. Each device responds to its own I2C slave address, which is selected using A0, A1, and A2. See Table 1. The MAX7500/MAX7501/MAX7502 employ four stan- dard I2C protocols: write byte, read byte, send byte, and receive byte (Figures 1, 2, and 3). The shorter receive byte protocol allows quicker transfers, provided that the correct data register was previously selected by a read-byte instruction. Use caution when using the shorter protocols in multimaster systems, as a second master could overwrite the command byte without informing the first master. The MAX7500 has eight dif- ferent slave addresses available; therefore, a maximum of eight MAX7500 devices can share the same bus. The MAX7501/MAX7502 each have four different slave addresses available. DEVICE BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 MAX7500 1 0 0 1 A2 A1 A0 RD/W MAX7501 1 0 0 1 1 A1 A0 RD/W MAX7502 1 0 0 1 0 A1 A0 RD/W Table 1. I2C Slave Addresses tBUF tSU:STO tHD:STA tSU:STA tHD:DAT tHIGH tLOW tSU:DAT tHD:STA SCL SDA tF tR ACKNOWLEDGE (A) STOP CONDITION (P) START CONDITION (S) START CONDITION (S) REPEATED START CONDITION (SR) PARAMETERS ARE MEASURED FROM 10% TO 90%. Figure 1. Serial Bus Timing |
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