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MAX6642ATT94-T Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX6642ATT94-T Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 14 page register was previously selected by a Write Byte instruction. Use caution when using the shorter proto- cols in multimaster systems, as a second master could overwrite the command byte without informing the first master. Read temperature data from the read internal tempera- ture (00h) and read external temperature (01h) regis- ters. The temperature data format for these registers is 8 bits for each channel, with the LSB representing +1°C (Table 1). Read the additional bits from the read extended tem- perature byte register (10h, 11h), which extends the data to 10 bits and the resolution to +0.25 °C per LSB (Table 2). When a conversion is complete, the main temperature register and the extended temperature register are updated. Alarm Threshold Registers Two registers store ALERT threshold values—one each for the local and remote channels. If either measured temperature equals or exceeds the corresponding ALERT threshold value, the ALERT interrupt asserts unless the ALERT bit is masked. The power-on-reset (POR) state of the local ALERT THIGH register is +70 °C (0100 0110). The POR state of the remote ALERT THIGH register is +120 °C (0111 1000). Diode Fault Detection A continuity fault detector at DXP detects an open cir- cuit on DXP, or a DXP short to VCC or GND. If an open or short circuit exists, the external temperature register is loaded with 1111 1111 and status bit 2 (OPEN) of the status byte is set to 1. Immediately after POR, the status register indicates that no fault is present. If a fault is present upon power-up, the fault is not indicated until the end of the first conversion. Diode faults do not set the ALERT output. ALERT Interrupts The ALERT interrupt occurs when the internal or external temperature reading exceeds a high temperature limit (user programmed). The ALERT interrupt output signal is latched and can be cleared only by reading the status register after the fault condition no longer exists or by successfully responding to the alert response address. If ±1°C, SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm _______________________________________________________________________________________ 7 SMBCLK AB C D E FG H I SMBDATA tSU:STA tHD:STA tLOW tHIGH tSU:DAT tHD:DAT tSU:STO tBUF A = START CONDITION B = MSB OF ADDRESS CLOCKED INTO SLAVE C = LSB OF ADDRESS CLOCKED INTO SLAVE D = R/W BIT CLOCKED INTO SLAVE E = SLAVE PULLS SMBDATA LINE LOW J K F = ACKNOWLEDGE BIT CLOCKED INTO MASTER G = MSB OF DATA CLOCKED INTO MASTER H = LSB OF DATA CLOCKED INTO MASTER I = ACKNOWLEDGE CLOCK PULSE J = STOP CONDITION K = NEW START CONDITION Figure 3. SMBus Read Timing Diagram TEMP ( °C) DIGITAL OUTPUT 130.00 1 000 0010 127.00 0 111 1111 126.00 0 111 1110 25 0 001 1001 0.00 0 000 0000 <0.00 0 000 0000 Diode fault (short or open) 1 111 1111 Table 1. Main Temperature Register (High Byte) Data Format FRACTIONAL TEMP (°C) DIGITAL OUTPUT 0.000 00XX XXXX 0.250 01XX XXXX 0.500 10XX XXXX 0.750 11XX XXXX Table 2. Extended Resolution Temperature Register (Low Byte) Data Format |
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