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NE1618 bảng dữ liệu(PDF) 2 Page - NXP Semiconductors |
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2 / 16 page Philips Semiconductors Product data NE1618 Temperature monitor for microprocessor systems 2 2002 Jan 04 853–2299 27510 FEATURES • Monitors local and remote temperature • Accuracy – ± 2 °C local (on-chip) sensor – ± 1.5 °C remote sensor with 1 °C resolution – ± 1.0 °C remote sensor with 0.125 °C resolution • No calibration required • Programmable over/under temperature alarm • SMBus 2-wire serial interface • 3 V to 3.6 V supply range • 80 µA supply current in operating mode • 3 µA (typical) supply current in standby mode • Small 16-lead QSOP package APPLICATIONS • Desktop computers • Notebook computers • Smart battery packs • Industrial controllers • Telecom equipment DESCRIPTION The NE1618 is an accurate two-channel temperature monitor. It measures the temperature of itself and the temperature of a remote sensor. It can replace the NE1617 for a more precise measurement to the remote temperature when it operates in extended mode. The remote sensor is a diode connected transistor being in the form of either a discrete NPN/PNP, such as the 2N3904/2N3906, or a diode connected PNP built into another die, such as is done on some INTEL microprocessors. The temperature of both the remote and local sensors are stored in the registers that can be read via a 2-wire SMBus. The data in the temp reading registers are updated at the end of every data conversion when the conversion is enable. At all time, data conversion is initiated automatically in the rate defined by the programmable data in the conversion rate register. However, a conversion can be forced to occur immediately by a one-shot programming. The local temp is always measured with a resolution of 1.0 °C but the remote temp can be measured in either one of two modes: extended mode with a resolution of 0.125 °C and basic mode with a resolution of 1.0 °C. The mode is set up automatically according to the programmable data stored in the conversion rate register. (See Table 6). Extended mode is set when the conversion rate is slow (rate 0.7 Hz or less) and normal mode is set when the rate is high (conversion rate of 2, 4, or 8 Hz). There is also an alarm that senses either an over or under temperature condition. The trip points for this alarm are also programmable. The device can have 1 of 9 addresses (determined by 2 address pins), so there can be up to 9 of the NE1618 on the SMBus. It can also be put in a standby mode (in order to save power). This can be done either with software (over the SMBus) or with hardware (using the STBY pin). PIN CONFIGURATION 9 10 11 12 13 14 15 16 1 2 3 4 5 6 7 8 TEST1 VDD D+ D– TEST5 ADD1 GND GND TEST16 STBY SCLK TEST13 SDATA ALERT ADD0 TEST9 SL01238 NE1618 Figure 1. Pin configuration PIN DESCRIPTION PIN # FUNCTION DESCRIPTION/COMMENTS 1 TEST1 Factory use only1 2 VDD Positive supply2 3 D+ Positive side of remote sensor 4 D– Negative side of remote sensor 5 TEST5 Factory use only1 6 ADD1 Device address pin (3-State) 7 GND Ground 8 GND Ground 9 TEST9 Factory use only1 10 ADD0 Device address pin (3-State) 11 ALERT Open drain output used as interrupt or SMBus alert 12 SDATA SMBus serial data input/output open drain 13 TEST13 Factory use only1 14 SCLK SMBus clock input 15 STBY Hardware standby input pin HIGH = normal operating mode LOW = standby mode 16 TEST16 Factory use only1 NOTES: 1. These pins should either floating or be tied to ground. 2. VDD pin should be decoupled by a 0.1 µF capacitor. ORDERING INFORMATION PART NUMBER PACKAGE DRAWING NUMBER NE1618DS 16-lead QSOP package1 SOT519–1 NOTE: 1. Also called “SSOP16”. |
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