MICROSTEPPING MOTOR CONTROLLER WITH DUAL DAC - New Japan Radio
Description
NJU39612
MICROSTEPPING MOTOR CONTROLLER WITH DUAL DAC
s GENERAL DESCRIPTION NJU39612 is a dual 7-bit+sign; Digital-to-Analog Converter (DAC) developed to be used in micro stepping applications together with the dual stepper motor driver.
The NJU39612 has a set of input registers connected to an 8-bit data port for easy interfacing directly to a microprocessor.
Two registers are used to store the data for each seven-bit DAC, the eighth bit being a sign bit (sign/magnitude coding).
s PACKAGE OUTLINE
NJU39612E2
s FEATURES • Analog control voltages from 3V down to 0.
0V • High-speed microprocessor interface • Full -scale error • Fast conversion speed • Package EMP20 ±1 LSB 3 µs
• Matches the dual stepper motor drivers
s BLOCK DIAGRAM
V DD
V Ref
NJU39612
WR Sign 1
E1 CS C
DA- Data 1
E D D/A
R
DA 1
A0
E2 DA D/A
DA- Data 2
2
E D7 - D0 C D
R
POR RESET
R
Sign 2
V ss
Figure 1.
Block Diagram
NJU39612
s PIN CONFIGURATION
Vref 1 DA1 2 Sign1 3 VDD 4 WR 5 D7 6 D6 7 D5 8 D4 9 D3 10
20 Reset 19 DA2 18 Sign2 17 Vss
NJU39612E2
16 CS 15 NC 14 A0 13 D0 12 D1 11 D2
Figure 2.
Pin configuration
s PIN DESCRIPTION
Refer to figure 2.
EMP Symbol Description
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
VRef DA1 Sign1 VDD WR D7 D6 D5 D4 D3 D2 D1 D0 A0 NC CS VSS Sign2 DA2 Reset
Voltage reference supply pin, 2.
5 V nominal (3.
0 V maximum) Digital-to-Analog 1, voltage output.
Output between 0.
0 V and Vref - 1 LSB.
Sign 1, TTL/CMOS level.
To be connected directly to NJM377x phase input.
Databit D7 is transfered non inverted from NJU39612 data input.
Voltage Drain-Drain, logic supply voltage.
Normally +5 V.
Write, TTL/CMOS level, input for writing to internal registers.
Data is clocked into flip flops on positive edge.
Data 7, TTL/CMOS level, input to set data bit 7 in data word.
Data 6, TTL/CMOS level, input to set data bit 6 in data word.
Data 5, TTL/CMOS level, input to set data bit 5 in data word.
Data 4, TTL/CMOS level, input to set data bit 4 in data word.
Data...
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