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MAX6697 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX6697 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 18 page Detailed Description The MAX6697 is a precision multichannel temperature monitor that features one local and six remote tempera- ture-sensing channels with a programmable alert threshold for each temperature channel and a program- mable overtemperature threshold for channels 1, 4, 5, and 6 (see Figure 1). Communication with the MAX6697 is achieved through the SMBus serial interface and a dedicated alert pin. 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 MAX6697 starts the conversion sequence by measuring the temperature on channel 1, followed by 2, 3, local channel, 4, 5, and 6. 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 MAX6697 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 seven channels is consid- erably greater in this mode than in the default mode. Low-Power Standby Mode Standby mode reduces the supply current to less than 15µA by disabling the internal ADC. Enter standby by setting the STOP bit to 1 in the configuration 1 register. During standby, data is retained in memory, and the SMBus interface is active and listening for SMBus com- mands. The timeout is enabled if a start condition is rec- ognized on SMBus. Activity on the SMBus causes the supply current to increase. If a standby command is received while a conversion is in progress, the conver- sion cycle is interrupted, and the temperature registers are not updated. The previous data is not changed and remains available. 7-Channel Precision Temperature Monitor 6 _______________________________________________________________________________________ PIN NAME FUNCTION 9 DXP5 Combined Current Source and A/D Positive Input for Channel 5 Remote Diode. Connect to the anode of a remote-diode-connected temperature-sensing transistor. Leave floating or connect to VCC if no remote diode is used. Place a 2200pF capacitor between DXP5 and DXN5 for noise filtering. 10 DXN5 Cathode Input for Channel 5 Remote Diode. Connect the cathode of the channel 1 remote-diode- connected transistor to DXN5. 11 DXN6 Cathode Input for Channel 6 Remote Diode. Connect the cathode of the channel 1 remote-diode- connected transistor to DXN6. 12 DXP6 Combined Current Source and A/D Positive Input for Channel 6 Remote Diode. Connect to the anode of a remote-diode-connected temperature-sensing transistor. Leave floating or connect to VCC if no remote diode is used. Place a 2200pF capacitor between DXP6 and DXN6 for noise filtering. 13, 14 NC_ No Connect. Must be connected to ground. 15 OVERT Overtemperature Active-Low, Open-Drain Output. OVERT asserts low when the temperature of channels 1, 4, 5, and 6 exceeds the programmed threshold limit. 16 VCC Supply Voltage Input. Bypass to GND with a 0.1µF capacitor. 17 ALERT SMBus Alert (Interrupt), Active-Low, Open-Drain Output. ALERT asserts low when the temperature of any channel exceeds the programmed ALERT threshold. 18 SMBDATA SMBus Serial-Data Input/Output. Connect to a pullup resistor. 19 SMBCLK SMBus Serial-Clock Input. Connect to a pullup resistor. 20 GND Ground Pin Description (continued) |
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Similar Description - MAX6697_09 |
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