MAX17823BGCV datasheet(28/121 Pages) MAXIM

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MAX17823B

12-Channel High-Voltage Data Acquisition System

www.maximintegrated.com

Maxim Integrated | 28

Measurement Data Transfer

By default, all ALU data is automatically transferred to the data registers (CELLn, VBLOCK, AIN1, AIN2, DIAG,

MINMAXCELL and TOTAL) at the end of each acquisition. The transfer occurs in parallel, that is, all data registers

are loaded at the same time. When this occurs, the DATARDY bit is set and the host can read out the data. In the

simplest, sequential approach, the host will initiate the acquisition by setting SCAN, wait for the acquisition to

complete (SCANDONE = 1), read the data registers, and then repeat the cycle.

Double-buffer Mode

The double-buffer mode (DBLBUFEN = 1) enables reduced cycle times by allowing the host to read out data registers

during the acquisition mode. In this mode, the automatic transfer of measurement results from the ALU to the data

registers is delayed until the start of the next acquisition. This delay allows the host to start reading out the first

acquisition data while the second acquisition is taking place and to finish reading out the first acquisition even as the

second acquisition completes. The host can then start a new acquisition and repeat the cycle. If the first acquisition

data is needed before starting the second acquisition, the host can perform a manual data transfer by setting

DATAMOVE. The manual transfer cannot occur in acquisition mode so the host may first verify that SCANDONE =

1. Flowcharts for operation of double-buffer mode are shown in Figures 12 and 13.

Note: An alternate double-buffer mode may be enabled (DBLBUFSEL = 1) that offers an even higher degree of

pipelining but at the cost of increased complexity in the application code. Contact Maxim Applications for details

regarding the alternate double-buffer mode.

ADC

BLOCK ALU

ALU1

ALUn

ALU12

ALU Registers

VBLOCK

Cell1

Celln

Cell12

Data Registers

DataMove

Trigger

ADCTSTEN

ADCTEST1A[11:0]

ADCTEST1B[11:0]

ADC_chop

ADCTEST2A[11:0]

ADCTEST2B[11:0]

OVSAMP_even_odd

UART Communication

AIN2

AIN1

DIAG ALU

DIAG

Figure 11. Measurement Data Flow

MAX17823BGCV Datasheet(PDF) 28 Page - Maxim Integrated Products

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