PBM3960 Ericsson Microelectronics, PBM3960 Datasheet

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PBM3960

Manufacturer Part Number
PBM3960
Description
PBM3960Microstepping Controller/Dual Digital-to-Analog Converter
Manufacturer
Ericsson Microelectronics
Datasheet
Figure 1. Block Diagram.
Description
PBM 3960/1 is a dual 7-bit+sign, Digital-to-Analog Converter (DAC) especially
developed to be used together with the PBL 3771/1, Precision Stepper Motor driver
in micro-stepping applications. The circuit 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). A second set of registers are used for automatic fast/slow current
decay control in conjunction with the PBL 3771/1, a feature that greatly improves
high-speed micro-stepping performance. The PBM 3960/1 is fabricated in a high-
speed CMOS process.
D7 - D0
RESET
WR
A0
A1
CS
POR
E1
E2
E3
E4
C
C
C
C
Dual Digital-to-Analog Converter
DA- Data 1
Level 1
Level 2
DA- Data 2
D
E
E
D
E
D
E
D
R
R
R
R
R
V
V
DD
ss
Digit
Comp
Digit
Comp
E1
E4
C
C
E
D
E
D
Microstepping Controller/
R
R
V
Ref
PBM 3960/1
D / A
D / A
Sign 1
CD 1
DA 1
DA
CD 2
Sign 2
2
Key Features
• Analog control voltages from 3 V
• High-speed microprocessor interface.
• Automatic fast/slow current decay
• Full-scale error 1 LSB.
• Interfaces directly with TTL levels and
• Fast conversion speed, 3 s.
• Matches PBL 3771.
down to 0.0 V.
control.
CMOS devices.
PBM 3960/1
28-pin plastic PLCC
22-pin plastic DIP
February 1999

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PBM3960 Summary of contents

Page 1

Description PBM 3960 dual 7-bit+sign, Digital-to-Analog Converter (DAC) especially developed to be used together with the PBL 3771/1, Precision Stepper Motor driver in micro-stepping applications. The circuit has a set of input registers connected to an 8-bit data ...

Page 2

PBM 3960/1 Maximum Ratings Parameter Voltage Supply Logic inputs Reference input Current Logic inputs Temperature Storage temperature Operating ambient temperature * refers to DIP package Recommended Operating Conditions Parameter Supply voltage Reference voltage A0-A1 D0-D7 ...

Page 3

Electrical Characteristics Electrical characteristics over recommended operating conditions. Parameter Symbol fig Logic Inputs Reset logic HIGH input voltage V IHR Reset logic LOW input voltage V ILR Logic HIGH input voltage V IH Logic LOW input voltage V IL Reset ...

Page 4

PBM 3960 ref Sign 3960/ Figure 4. Pin configuration. Pin Descriptions Refer to figure 4. ...

Page 5

Definition of Terms Resolution Resolution is defined as the reciprocal of the number of discrete steps in the DAC output directly related to the number of switches or bits within the DAC. For example, PBM 3960/1 has 2 ...

Page 6

PBM 3960/1 Where (D … the new value being 6 0 sent to DA-Data1 and (Q … DA Data1’s old value. (L … are the 61 41 three bits for ...

Page 7

Time when motor compromise position. Time when micro position is correct. Write signal. Motor position. Writing to channel 1. Writing to channel 2. Write time = incorrect position Useful time = correct position Figure 11. Double pulse ...

Page 8

PBM 3960/1 Counter Clock Up/Dn Step Control Logic Direction Figure 13. Typical blockdiagram of an application without a microprocessor. Available as testboard, TB 307i/ PBM 3960 ...

Page 9

This is the ideal solution for a system where there is an available micropro- cessor with extra capacity and low cost is more essential than simplicity. See typical application, figure 14. User Hints Never disconnect ICs or PC Boards when ...

Page 10

PBM 3960/1 Ordering Information Package Part No. DIP Tube PBM 3960/1NS PLCC Tube PBM 3960/1QNS PLCC Tape & Reel PBM 3960/1QNT Information given in this data sheet is believed to be accurate and reliable. However no responsibility is assumed for ...

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