MAX17843ACB datasheet(24/131 Pages) MAXIM

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Detailed Description

The data-acquisition system consists of the major blocks as described in Table 1.

Table 1. System Blocks

BLOCK

DESCRIPTION

ADC1

Primary analog-to-digital converter. Uses a 12-bit successive-approximation register (SAR), with a

reference voltage of 2.307V and is supplied by VAA. VAA diagnostic result yields VAA. This is the default

ADC selected by the ADCSELECT bit in the SCANCTRL register.

ADC2

Secondary analog-to-digital converter. Uses a 12-bit successive-approximation register (SAR) with a

reference voltage of 2.307V and is supplied by VAA. This is the secondary ADC. VAA diagnostic result

yields VAA/2. Writing the ADCSELECT bit to 1 selects this ADC for measurements.

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

that 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 downstack devices. Autodetects baud rates of 0.5, 1, or

2Mbps.

UPPER PORT

Differential UART for communication with upstack 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.

MAX17843

12-Channel, High-Voltage Smart Sensor

Data-Acquisition Interface

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