TMC246/A ETC2 [List of Unclassifed Manufacturers], TMC246/A Datasheet - Page 22

• Manufacturer Part Number: TMC246/A
• Description: High Current Microstep Stepper Motor Driver with sensorless stall detection, protection / diagnosis and SPI Interface
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

TMC246 DATA SHEET (V2.01 / Sep. 14th, 2005)
SPI Interface Timing
Propagation Times
(3.0 V ≤ VCC ≤ 5.5 V, -40°C ≤ Tj ≤ 150°C; V
unless otherwise specified)
SDO is tristated whenever ENN is inactive (high) or CSN is inactive (high).
Using the SPI interface
The SPI interface allows either cascading of multiple devices, giving a longer shift register, or working
with a separate chip select signal for each device, paralleling all other lines. Even when there is only
one device attached to a CPU, the CPU can communicate with it using a 16 bit transmission. In this
case, the upper 4 bits are dummy bits.
SPI Filter
To prevent spikes from changing the SPI settings, SPI data words are only accepted, if their length is
at least 12 bit.
Copyright © 2005, TRINAMIC Motion Control GmbH & Co KG
Symbol
f
t
t
t
t
t
t
SCK
t
DSU
t
t
CH
DH
ZC
ES
PD
CL
D
1
ENN
CSN
SDO
SCK
SDI
Parameter
SCK frequency
SCK stable before and after
CSN change
Width of SCK high pulse
Width of SCK low pulse
SDI setup time
SDI hold time
SDO delay time
CSN
impedance
ENN to SCK setup time
CSN high to output change
delay
high
t
1
t
ES
to
t
CL
SDO
t
D
bit11
bit11
t
CH
high
t
IH
DU
Conditions
bit10
= 2.8V, V
bit10
C
ENN = 0
L
t
DH
= 50pF
IL
= 0.5V; tr, tf = 10ns; C
bit0
bit0
Min
100
100
t
DC
50
40
50
50
30
1
t
1
t
ZC
Typ
40
3
L
= 50pF,
Max
100
4
MHz
Unit
ns
ns
ns
ns
ns
ns
ns
ns
µs
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