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NE1617DS Datenblatt(PDF) 10 Page - NXP Semiconductors |
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NE1617DS Datenblatt(HTML) 10 Page - NXP Semiconductors |
10 / 16 page Philips Semiconductors Product specification NE1617 Temperature monitor for microprocessor systems 1999 Mar 19 10 TEMPERATURE MONITOR WITH SMB SERIAL INTERFACE Serial bus interface The device can be connected to a standard 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 operation of the device to the bus is described with details in the following sections. Slave address The device address is defined by the logical connections applied to the device pins ADD0 and ADD1. A list of selectable addresses are shown in Table 1. The device address can be set to any one of those nine combinations and more than one device can reside on the same bus without address confliction. Note that the state of the device address pins is sampled and latched not only at power-up step but also at starting point of every conversion. Table 1. Device slave address ADD0* ADD1* ADDRESS BYTE 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 NC = Not Connected. * Any pull-up/down resistor used to connect to GND or VDD should be ≤ 2kΩ. Registers The device contains more than 9 registers. They are used to store the data of device setup and operation results. Depending on the bus communication (either read or write operations), each register may be called by different names because each register may have different sub-addresses or commands for read and write operations. For example, the configuration register is called as WC for write mode and as RC for read mode. Table 2 (Register Assignments) shows the names, commands and functions of all registers as well the register POR states. Note that attempting to write to a read-command or read from a write-command will produce an invalid result. The reserved registers are used for factory test purposes and should not be written to. Low power standby modes Upon POR, the device is reset to its normal free-running auto-conversion operation mode. The device can be put into standby mode by either using hardware control (connect the STBY pin to LOW for hardware standby mode) or using software control (set bit 6 of the configuration register to HIGH for software standby mode). When the device is put in either one of the standby modes, the supply current is reduced to less than 10 µA if there is no SMBus activity, all data in the device registers are retained and the SMBus interface is still alive to bus communication. However, there is a difference in the device ADC conversion operation between hardware standby and software standby modes. In hardware standby mode, the device conversion is inhibited and the one-shot command does not initiate a conversion. In software standby mode, the one-shot command will initiate a conversion for both internal and external channels. If a hardware standby command is received when the device is in normal mode and a conversion is in progress, the conversion cycle will stop and data in reading temperature registers will not be updated. Table 2. Register assignments REGISTER NAME COMMAND BYTE POR STATE FUNCTION RIT 00h 0000 0000 Read internal or local temp byte RET 01h 0000 0000 Read external or remote temp byte RS 02h n/a Read status byte RC 03h 0000 0000 Read configuration byte RCR 04h 0000 0010 Read conversion rate byte RIHL 05h 0111 1111 Read internal temp HIGH limit byte RILL 06h 1100 1001 Read internal tem low limit byte REHL 07h 0111 1111 Read external temp HIGH limit byte RELL 08h 1100 1001 Read external temp LOW limit byte WC 09h n/a Write configuration byte WCR 0Ah n/a Write conversion rate byte WIHL 0Bh n/a Write internal temp HIGH limit byte WILL 0Ch n/a Write internal temp LOW limit byte WEHL 0Dh n/a Write external temp HIGH limit byte WELL 0Eh n/a Write external temp LOW limit byte OSHT 0Fh n/a One shot command RESERVED 10h n/a Reserved RESERVED 11h n/a Reserved RESERVED 12h n/a Reserved RESERVED 13h n/a Reserved |
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