TMC246_06 Datasheet, PDF (24/26 Pages) List of Unclassifed Manufacturers – High Current Microstep Stepper Motor Driver with sensorless stall detection, protection / diagnosis and SPI Interface

TMC246 / TMC246A DATA SHEET (V2.03 / Nov. 6th, 2006)
24
SPI Interface Timing
ENN
CSN
SCK
SDI
SDO
t_ES
t₁
t_CL
t_CH
bit11
t_D
bit11
t_DU
t_DH
bit10
bit10
t₁ t₁
bit0
t_ZC
bit0
Propagation Times
(3.0 V ≤ VCC ≤ 5.5 V, -40°C ≤ Tj ≤ 150°C; V_IH = 2.8V, V_IL = 0.5V; tr, tf = 10ns; C_L = 50pF,
unless otherwise specified)
Symbol Parameter
Conditions Min
f_SCK
SCK frequency
ENN = 0
DC
t₁
SCK stable before and after CSN
50
change
t_CH
Width of SCK high pulse
100
t_CL
Width of SCK low pulse
100
t_DU
SDI setup time
40
t_DH
SDI hold time
50
t_D
SDO delay time
C_L = 50pF
t_ZC
CSN high to SDO high impedance
*)
50
t_ES
ENN to SCK setup time
30
t_PD
CSN high to OA / OB output
**)
polarity change delay
t_LD
Load indicator valid after OA / OB
output polarity change
Typ
Max Unit
4
MHz
ns
ns
ns
ns
ns
40
100 ns
ns
ns
3
t_OSC + 4 µs
5
7
µs
*) SDO is tristated whenever ENN is inactive (high) or CSN is inactive (high).
**) Whenever the PHA / PHB polarity is changed, the chopper is restarted for that phase. However, the chopper does not switch
on, when the SRA resp. SRB comparator threshold is exceeded upon the start of a chopper period.
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