MAXQ3180-KIT datasheet, PDF - EEWORLD Datasheet

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MAXQ3180-KIT: DescriptionDevelopment Boards u0026 Kits - Other Processors MAXQ3180 Eval Kit; CategoryDevelopment board/suite/development tools; File Size107KB，7 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html

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Development Boards u0026 Kits - Other Processors MAXQ3180 Eval Kit

MAXQ3180-KIT Parametric

Parameter Name	Attribute value
Product Category	Development Boards & Kits - Other Processors
Manufacturer	Maxim
RoHS	No
Product	Evaluation Kits
Tool Is For Evaluation Of	MAXQ3180
Core	MAXQ
Data Bus Width	16 bit
Interface Type	SPI
Maximum Operating Temperature	+ 70 C
Minimum Operating Temperature	0 C
Packaging	Bulk
Factory Pack Quantity	1

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Application Notes

Microcontrollers

> APP 4246

Keywords:

SPI,electricity meter,microcontroller,communication

APPLICATION NOTE 4246

How to Use Serial Peripheral Interface (SPI) on

the MAXQ3180 Microcontroller

By: Ben Smith

Jun 17, 2008

Abstract: The MAXQ3180 microcontroller is a polyphase analog front-end for an electricity meter. It

incorporates all functions needed for modern, multifunction electricity metering. The MAXQ3180

communicates its readings to a host microcontroller by means of a Serial Peripheral Interface (SPI™)

bus. This application note describes how this interface is done, and presents sample code to assist the

designer in implementing the communications mechanism.

Overview of SPI

The Serial Peripheral Interface (SPI) is an interdevice bus protocol that provides fast, synchronous, full-

duplex communications between chips. One device, the

master,

drives the synchronous clock and

selects which of several

slaves

is being addressed. Every SPI peripheral consists of a single shift register

and control circuitry so that an addressed serial peripheral interface SPI peripheral is simultaneously

transmitting and receiving.

Figure 1. Illustration for a SPI slave.

There are four discrete circuits used in SPI communication:

SCLK:

The synchronous clock used by all devices. The master drives this clock and the slaves

receive the clock. Note that SCLK can be gated and need not be driven between SPI transactions.

MOSI:

Master out, slave in. This is the main data line driven by the master to all slaves on the SPI

bus. Only the selected slave clocks data from MOSI.

MISO:

Master in, slave out. This is the main data line driven by the selected slave to the master.

Only the selected slave may drive this circuit. In fact, it is the only circuit in the SPI bus

arrangement that a slave is

ever

permitted to drive.

SSEL:

This signal is unique to each slave. When active (generally low) the selected slave must

Page 1 of 7

drive MISO.

For this discussion, it is critical to note that

a SPI peripheral transmits and receives at the same time.

handy way to think of this is that the master always sends one byte and receives one byte.

Some SPI peripherals sacrifice speed in favor of simulating a half-duplex operation. This is not the case

with the

MAXQ3180

microcontroller, which is truly a full-duplex SPI slave.

The remainder of this application note describes how to connect and successfully use the MAXQ3180 on

a SPI bus.

MAXQ3180 Communications Overview

To the master (i.e., host), the MAXQ3180 looks like a memory array that consists of both RAM and

ROM. This is because the ROM firmware in the MAXQ3180 reads its operational parameters from RAM,

and places its results in RAM. Consequently, configuring a MAXQ3180 is as simple as performing a

block write to its RAM locations.

Some MAXQ3180 "memory" locations trigger actions within the device to calculate electricity metering

results "on the fly." Writes to these locations are a "nop." The specific function and purpose of RAM and

virtual ROM locations are beyond the scope of this document. The important fact here is that the

microcontroller really has only two operations for SPI communication: read and write.

Every transaction in the MAXQ3180 begins with the master sending two bytes that contain the command

(i.e., read or write), the address to access, and the number of bytes to access. As mentioned above,

every SPI peripheral returns a byte for every byte received. The MAXQ3180, therefore, returns 0xC1

after receiving the first command byte, and 0xC2 after the second command byte. The protocol is

illustrated below in

Figure 2.

Figure 2. Master reads and writes data to the MAXQ3180.

If the master is reading one or more bytes, it must send dummy bytes. Remember that the master

cannot receive

anything

from the slave unless it sends something: send a byte to get a byte. But after

receiving a command, the MAXQ3180 may have to calculate the result and thus may not have it ready

when the master sends the dummy byte. For this reason, the MAXQ3180

always

sends zero or more

Page 2 of 7

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