MAX17823BGCV datasheet(13/121 Pages) MAXIM

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MAX17823B

12-Channel High-Voltage Data Acquisition System

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Detailed Description

The data acquisition system consists of the major blocks shown in Figure 1 and described in Table 1.

Table 1. System Blocks

Block

Description

ADC

Analog-to-Digital Converter. Uses a 12-bit successive-approximation register (SAR) with a

reference voltage of 2.307V and supplied by VAA.

HVMUX

12-channel high-voltage (65V) differential multiplexer for Cn inputs.

HV CHARGE PUMP

High-voltage charge-pump supply (VDCIN + 5.5V) for the HVMUX, ALTMUX, BALSW, and LSAMP

circuits which must switch high-voltage signals. Supplied by DCIN.

LSAMP

Level-shifting amplifier with a gain of 6/13. The result is that a 5V differential signal is attenuated to

2.307V, which is the reference voltage for the ADC.

LVMUX

Multiplexes various low-voltage signals including the level-shifted signals and temperature signals to

the ADC for subsequent A-to-D conversion.

ALTMUX

12-channel, high-voltage differential multiplexer for SWn inputs.

BALSW

Cell-balancing switches.

LINREG

3.3V (VAA) linear regulator used to power the ADC and digital logic. Supplied by DCIN (9V to 65V).

REF

2.307V precision reference voltage for ADC and LINREG. Temperature-compensated.

ALTREF

1.242V precision reference voltage used for diagnostics.

16MHZ OSC

16MHz oscillator with 2% accuracy for clocking state-machines and UART timing.

32KHZ OSC

32,768Hz oscillator for driving charge pumps and timers.

LOWER PORT

Differential UART for communication with host or down-stack devices. Auto-detects baud rates of

0.5Mbps, 1Mbps, or 2Mbps.

UPPER PORT

Differential UART for communication with up-stack devices.

CONTROL AND STATUS

ALUs, control logic, and data registers

DIE TEMP

A Proportional-to-Absolute-Temperature (PTAT) voltage source used to measure the die

temperature.

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