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MAX6602 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX6602 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 18 page Detailed Description The MAX6602 is a precision multichannel temperature monitor that features one local and four remote temper- ature-sensing channels with a programmable alert threshold for each temperature channel and a program- mable overtemperature threshold for channels 1 and 4 (see Figure 1). Communication with the MAX6602 is achieved through the SMBus serial interface and a dedicated alert output. The alarm outputs, OVERT and ALERT, assert if the software-programmed temperature thresholds are exceeded. ALERT typically serves as an interrupt, while OVERT can be connected to a fan, sys- tem shutdown, or other thermal-management circuitry. ADC Conversion Sequence In the default conversion mode, the MAX6602 starts the conversion sequence by measuring the temperature on channel 1, followed by 2, 3, local channel, and 4. The conversion result for each active channel is stored in the corresponding temperature data register. In some systems, one of the remote thermal diodes may be monitoring a location that experiences temperature changes that occur much more rapidly than in the other channels. If faster temperature changes must be moni- tored in one of the temperature channels, the MAX6602 allows channel 1 to be monitored at a faster rate than the other channels. In this mode (set by writing a 1 to bit 4 of the configuration 1 register), measurements of channel 1 alternate with measurements of the other channels. The sequence becomes channel 1, channel 2, channel 1, channel 3, channel 1, etc. Note that the time required to measure all five channels is consider- ably greater in this mode than in the default mode. Low-Power Standby Mode Enter software standby mode by setting the STOP bit to 1 in the configuration 1 register. Enter hardware standby by pulling STBY low. Software standby mode disables the ADC and reduces the supply current to approxi- mately 30µA. Hardware standby mode halts the ADC clock, but the supply current is approximately 350µA. During either software or hardware standby, data is retained in memory, and the SMBus interface is active and listening for SMBus commands. The timeout is enabled if a start condition is recognized on SMBus. Activity on the SMBus causes the supply current to increase. If a standby command is received while a con- version is in progress, the conversion cycle is interrupt- ed, and the temperature registers are not updated. The previous data is not changed and remains available. Five-Channel Precision Temperature Monitor 6 _______________________________________________________________________________________ PIN NAME FUNCTION 7 DXP4 Combined Current Source and A/D Positive Input for Channel 4 Remote Diode. Connect to the anode of a remote-diode-connected temperature-sensing transistor. Leave floating or connect to DXN4 if no remote diode is used. Place a 2200pF capacitor between DXP4 and DXN4 for noise filtering. 8 DXN4 Cathode Input for Channel 4 Remote Diode. Connect the cathode of the channel 1 remote-diode- connected transistor to DXN4. 9 STBY Standby Input. Drive STBY logic-low to place the MAX6602 in hardware standby mode, or logic-high for normal operation. Temperature and threshold data are retained in standby mode. 10 N.C. No Connection. Must be connected to ground. 11 OVERT Overtemperature Active-Low, Open-Drain Output. OVERT asserts low when the temperature of channels 1 and 4 exceed the programmed threshold limit. 12 VCC Supply Voltage Input. Bypass to GND with a 0.1µF capacitor. 13 ALERT SMBus Alert (Interrupt), Active-Low, Open-Drain Output. ALERT asserts low when the temperature of any channel exceeds the programmed ALERT threshold. 14 SMBDATA SMBus Serial-Data Input/Output. Connect to a pullup resistor. 15 SMBCLK SMBus Serial-Clock Input. Connect to a pullup resistor. 16 GND Ground Pin Description (continued) |
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