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NE1618DS Datasheet(PDF) 7 Page - NXP Semiconductors |
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NE1618DS Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 16 page Philips Semiconductors Product data NE1618 Temperature monitor for microprocessor systems 2002 Jan 04 7 FUNCTIONAL DESCRIPTION Serial bus interface The NE1618 can be connected to a compatible 2-wire serial interface System Management Bus (SMBus) as a slave device under the control of a master device, using two device terminals SCLK and SDATA. The controller will provide a clock signal to the device SCLK pin and write/read data to/from the device through the device SDATA pin. External pull-up resistors, about 10 k Ω each, are needed for these two terminals due to the open drain circuitry. Data of 8-bit digital byte or word are used for communication between the controller and the device using SMBus protocols which will be described more in the SMBus interface section. The operation of the device to the bus is described with details in the following sections. Slave address The 7-bit address data of the NE1618 on the bus is defined by three-level logical connections applied to the device address pins ADD0 and ADD1. They are either opened or connected directly to the GND or VDD with the use of a resistor which value should be equal to or less than 2 k Ω. The selectable addresses are listed in Table 1. Any one of those nine combinations can be used for any device and more than one devices can reside on the same bus without conflict. Notice that because the state of the device address pins is sampled and latched not only at the power-up step but also at starting point of every conversion, the address connections must be permanently existent. Table 1. Device slave address ADD0 pin ADD1 pin 7-BIT ADDRESS DATA GND GND 0011 000 GND NC 0011 001 GND VDD 0011 010 NC GND 0101 001 NC NC 0101 010 NC VDD 0101 011 VDD GND 1001 100 VDD NC 1001 101 VDD VDD 1001 110 1. NC = Not Connected. Registers The NE1618 contains a number of registers which names, commands, power-on reset (POR) status and functions are listed in Table 2. It includes: • Configuration register to provide control and configuration the NE1618 • Status register to provide the flags resulting from temp limit comparisons • Measuring and limits temp registers • ID and test registers The registers are used to store either programmable data for setting device operation or resultant data from device measurement. Data are stored in registers by 8-bit digital byte, either in 2’s complement format for temperature-related data or in straight format for others. The register command byte is used to addressing the register in SMBus communication. Writing and reading registers will be performed on the SMBus by a controller. The registers are divided into two groups: only-read registers named with a prefix of R– and only-write registers named with a prefix of W– (including the one-shot register OSHT). You should write programmable data to the only-write registers and read data from the only-read registers. Attempting to write to any R– register or read from any W– register will produce an invalid result: the writing data would be ignored, the reading data would be equal to FFh. Some of registers are in pair representing a same item for different bus operations: read and write, for example, RC and WC are related to the device configuration, one for reading and the other for writing. The reserved registers are used only at the manufacturer for test purposes. |
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