NJU39610 datasheet, PDF - EEWORLD Datasheet

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NJU39610: DescriptionSTEPPER MOTOR CONTROLLER, PQCC28; Categorysemiconductor Analog mixed-signal IC; File Size161KB，11 Pages; ManufacturerNew JRC; Websitehttps://www.njr.com

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NJU39610 Overview

STEPPER MOTOR CONTROLLER, PQCC28

NJU39610 Parametric

Parameter Name	Attribute value
Number of functions	1
Number of terminals	28
Minimum operating temperature	-20 Cel
Maximum operating temperature	85 Cel
Rated supply voltage	5 V
Minimum supply/operating voltage	4.75 V
Maximum supply/operating voltage	5.25 V
Processing package description	PLASTIC, LCC-28
each_compli	Yes
state	Active
Analog IC other types	STEPPER MOTOR CONTROLLER
jesd_30_code	S-PQCC-J28
jesd_609_code	e0
moisture_sensitivity_level	2
Packaging Materials	PLASTIC/EPOXY
ckage_code	QCCJ
ckage_equivalence_code	LDCC28,.5SQ
packaging shape	SQUARE
Package Size	CHIP CARRIER
eak_reflow_temperature__cel_	260
wer_supplies__v_	5
qualification_status	COMMERCIAL
seated_height_max	4.7 mm
sub_category	Motion Control Electronics
surface mount	YES
Temperature level	OTHER
terminal coating	TIN LEAD
Terminal form	J BEND
Terminal spacing	1.27 mm
Terminal location	QUAD
ime_peak_reflow_temperature_max__s_	NOT SPECIFIED
length	11.51 mm
width	11.51 mm

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NJU39610

MICROSTEPPING MOTOR CONTROLLER WITH DUAL DAC

GENERAL DESCRIPTION

NJU39610 is a dual 7-bit+sign, Digital-to-Analog Converter

(DAC) especially developed to be used together with the

NJM3771, Precision Stepper Motor driver in micro-stepping

applications. The NJU39610 has a set of input registers

connected to an 8-bit data port for easy interfacing directly to

a microprocessor. The NJU39610 is well suited for high-

speed micro-stepping application.

PACKAGE OUTLINE

NJU39610D2

NJU39610FM2

FEATURES

• Analog control voltages from 3 V down to 0.0 V

• High-speed microprocessor interface

• Automatic fast/slow current decay control

• Full-scale error

• Fast conversion speed

• Matches NJM3771

• Packages

DIP22/PLCC28

±1

LSB

µs

BLOCK DIAGRAM

Ref

NJU39610

Level 2

DA- Data 1

Sign 1

Level 1

Digit

Comp

CD 1

DA 1

D7 - D0

DA- Data 2

D/A

Digit

Comp

CD 2

Sign 2

POR

RESET

Figure 1. Block Diagram

NJU39610

DEFINITION OF TERMS

Resolution

Resolution is defined as the reciprocal of the number of discrete steps in the DAC output. It is directly related to the

number of switches or bits within the DAC. For example, NJU39610 has 2

, or 128, output levels and therefor has 7

bits resolution. Remember that this is not equal to the number of microsteps available.

Linearity Error

Linearity error is the maximum deviation from a straight line passing through the end points of the DAC transfer

characteristic. It is measured after adjusting for zero and full scale. Linearity error is a parameter intrinsic to the

device and cannot be externally adjusted.

Power Supply Sensitivity

Power supply sensitivity is a measure of the effect of power supply changes on the DAC full-scale output

Settling Time

Full-scale current settling time requires zero-to-full-scale or full-scale-to-zero output change. Settling time is the

time required from a code transition until the DAC output reaches within

LSB of the final output value.

Full-scale ErrorFull-scale error is a measure of the output error between an ideal DAC and the actual device output.

Differential Non-linearity

The difference between any two consecutive codes in the transfer curve from the theoretical 1LSB, is differential

non-linearity

Monotonic

If the output of a DAC increases for increasing digital input code, then the DAC is monotonic. A 7-bit DAC which is

monotonic to 7 bits simply means that increasing digital input codes will produce an increasing analog output.

NJU39610 is monotonic to 7 bits.

FUNCTIONAL DESCRIPTION

Each DAC channel contains two registers, a digital comparator, a flip flop, and a D/A converter. A block diagram is

shown on the first page. One of the registers stores the current level, below which, fast current decay is initiated.

The status of the CD outputs determines a fast or slow current decay to be used in the driver.

The digital comparator compares each new value with the previous one and the value for the preset level for fast

current decay. If the new value is strictly lower than both of the others, a fast current decay condition exists. The flip

flop sets the CD output. The CD output is updated each time a new value is loaded into the D/A register. The fast

current decay signals are used by the driver circuit, NJM3771, to change the current control scheme of the output

stages. This is to avoid motor current dragging which occurs at high stepping rates and during the negative current

slopes, as illustrated in figure 9. Eight different levels for initiation of fast current decay can be selected.

The sign outputs generate the phase shifts, i.e., they reverse the current direction in the phase windings.

Output

Actual

Gain

error

Correct

Endpoint

non-linearity

than 2

bits

Less

than 2

bits

Negative

difference

Positive

difference

Offset error

Full scale

Input

Figure 5. Errors in D/A conversion.

Figure 4. Errors in D/A conversion.

Figure 3. Errors in D/A conversion.

Differential non-linearity of more than Differential non-linearity of less than 1 Non-linearity, gain and offset errors.

bit, output is monotonic.

1 bit, output is non-monotonic.

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