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MCP9844 Datasheet(PDF) 11 Page - Microchip Technology |
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MCP9844 Datasheet(HTML) 11 Page - Microchip Technology |
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11 / 40 page  2013 Microchip Technology Inc. DS20005192B-page 11 MCP9844 5.1 Registers The MCP9844 device has several registers that are user accessible. These registers include the Capability register, Configuration register, Event Temperature Upper-Boundary and Lower-Boundary Trip registers, Critical Temperature Trip register, Temperature register, Manufacturer Identification register and Device Identification register. The Temperature register is read-only and is used to access the ambient temperature data. The data is loaded in parallel to this register after tCONV. The Event Temperature Upper-Boundary and Lower-Boundary Trip registers are read/writes. If the ambient temperature drifts beyond the user-specified limits, the MCP9844 device outputs a signal using the Event pin (refer to Section 5.2.3 “Event Output Configuration” ). In addition, the Critical Temperature Trip register is used to provide an additional critical temperature limit. The Capability register is used to provide bits describing the MCP9844’s capability in measurement resolution, measurement range and device accuracy. The device Configuration register provides access to configure the MCP9844’s various features. These registers are described in further detail in the following sections. The registers are accessed by sending a Register Pointer to the MCP9844 using the serial interface. This is an 8-bit write-only pointer. Register 5-1 describes the pointer or the address of each register. This device will not acknowledge commands to register pointers other than those listed in Register 5-1. REGISTER 5-1: REGISTER POINTER (WRITE ONLY) W-0 W-0 W-0 W-0 W-0 W-0 W-0 W-0 — — — — Pointer Bits bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 7-4 Writable Bits: Write ‘0’ bit 3-0 Pointer Bits: 0000 = Capability register 0001 = Configuration register (CONFIG) 0010 = Event Temperature Upper-Boundary Trip register (TUPPER) 0011 = Event Temperature Lower-Boundary Trip register (TLOWER) 0100 = Critical Temperature Trip register (TCRIT) 0101 = Temperature register (TA) 0110 = Manufacturer ID register 0111 = Device ID/Revision register 1000 = Reserved 1001 = Resolution register 1XXX = Unused (The device will not acknowledge commands to other pointer locations.) |
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Similar Description - MCP9844_14 |
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