MAX1452AAE+C8H Meaning of suffix C8H

C8H suffix is for a version of the MAX1452AAE+ chip that internally uses the VDDF signal to start operation as opposed to the standard version that uses VDD signal. We made the change from VDD to VDDF which is a better concept and makes the startup process more robust. The C8H also denotes the SSOP package as opposed to C8J that denotes the TQFN package.

Is there any possibility Maxim will offer MAX1452 in temperature range higher than +125°C?

Answer: No. This issue has been investigated by the MAX1452 business unit and it has been determined that Maxim cannot offer this device in higher than +125°C temperature range as neither the package nor the process can be guaranteed in that range. There is, specifically, no possibility of customizing the MAX1452 for temperature operation outside the existing -40°C to +125°C Automotive temp range.

What are the differences between the MAX1455EVKIT-NS and MAX1455EVKIT-CS?

The MAX1455EVKIT-CS includes a 100KPAG pressure sensor and the EV Kit board has been compensated over temperature (-40°C to +125°C) and pressure (0KPAG to 100 KPAG). The MAX1455EVKIT-NS does not include the pressure sensor. However, to evaluate the signal conditioner, the MAX1455EVKIT-NS must be used.

What are the MAX1452 voltage threshold (logic) levels for the DIO signal?

The recommended levels are: 1V = low, and 4V = high. However, the real limits are VDD/2 ±0.5V. Restated, that is, 2V and 3V for VDD = 5V.

What is the largest sensor output that can produce 4V of span (VDD = 5V) in the MAX1452, without requiring an external circuit?

The largest sensor output can be determined when the smallest excitation voltage setting of 1.5V (VDD = 5V) and smallest PGA gain (39x) are applied. The applying equation is: sensor output (mV/V) = Span (V) / [VBDR (V) x PGA-Gain (V/V)] x 1000. The largest possible sensor output is 68mV/V.

Should the serial cable required between the PC and KEY for the MAX1452 be a null modem (straight through) or cross cable?

The cable is a straight-through connection (basically an extension cable). One is included in the MAX1452 EV kit package.

What is the smallest sensor output that can produce 4V of span (VDD = 5V) in the MAX1452 without requiring external amplification?

The smallest sensor output can be determined when the largest excitation voltage setting of 4.5V (VDD = 5V) and the largest PGA gain (234x) are applied. The applying equation is: Sensor Output (mV/V) = Span (V) / [VBDR (V) x PGA-Gain (V/V)] x 1000 The smallest possible sensor output is 4mV/V.

Must I use the KEY (interface adapter) provided by Maxim to communicate with the MAX1452 signal conditioner?

Not necessarily, but it is highly recommended. The KEY has been designed to provide reliable communication by ensuring correct timing and correct signal levels. The KEY has proven to be reliable in many applications.

I have downloaded and installed the latest MAX1452 EV kit software from the website, but when I run the software I get the message, "missing DIPortIO.dll." What is the problem and what should I do?

You are missing the drivers required for operating systems newer than Windows 95. Run the Port98nt.exe supplied with the MAX1452 EV kit software to install the missing drivers. You need to run the Port98nt.exe only one time.

I get the "divide by zero" error when I launch the MAX1452 EV kit software. What is the problem?

You are probably not running the latest version of the MAX1452 EV kit software. This problem has been resolved in the latest version, which can be downloaded from the Maxim website. Contact the factory if the problem persists.

When operating in MAX1452 digital mode and the output MUX is activated for "infinite" output duration, communication is blocked for 9s before it's released to accept digital commands.How can I get around this after reading the output from a D

The power to the signal conditioner, VDD, must be cycled. If the supplied KEY and MAX1452 Evaluation Kit (EV kit) software are used, the hard_init (mode = 1) function included in the serial.dll must be executed to cycle power. In this mode (mode = 1), the prepower-cycle contents of the DACs will be automatically restored, so the power cycle operation will be transparent to the compensation process.

During the compensation process, can I connect the +5V of the power supply directly to the VDD of the MAX1452 signal conditioner?

No. The signal conditioner's VDD must be connected through the KEY so that power to the signal conditioner can be controlled by software. This connection is required for synchronization and to speed up the compensation process by avoiding the nine seconds wait time for every voltage read through a DMM.

Can the MAX1452's signal conditioner be operated beyond the product's operating temperature range?

The MAX1452's data sheet performance specification is guaranteed only when the product is operated within its specified operating range. However, the product will continue to operate as long as the maximum operating condition is not violated.

My sensor has very high impedance. Can I still use the MAX1452 as a signal conditioner?

Yes. The MAX1452 can be used in voltage-bridge-drive mode for this type of application. Contact the factory for assistance.

Is the MAX1452 a drop-in replacement for the MAX1459?

The MAX1452 is not a drop-in replacement for the MAX1459 but is recommended for new designs.

What is the difference between the MAX1452 and the MAX1455?

The MAX1452 and MAX1455 are based on the same internal architecture with similar functions and performance. The MAX1455 is intended for automotive applications because it includes output-clip voltage limits. The MAX1452 can support 4-20mA applications.

What are the recommended values for the MAX1452 offset TC DAC and FSOTC DAC, if they are not used for first-order temperature compensation?

The offset TC DAC and FSOTC DAC can be set to any arbitrary value. However, it is recommended that they be set to non-zero values, e.g., 0x0200.

What is the VDD voltage level which indicates that the MAX1452 signal conditioner is completely turned off?

The VDD voltage level is 0.5V. This voltage will guarantee that all transistors are turned off. Reapplying VDD will cause a power-on-reset sequence.

Has the MAX1452 been certified to meet the RTCA DO-178B standard?

No, the MAX1452 has not been tested against this standard.

For the MAX1452, what is the long term stability per year? Is there any test data?

We have not collected long term stability data. But the part have been used by many customers for more than a decade and we have not received any report of long term drift for this part.