AMIS-30624 Datasheet, PDF (11/56 Pages) AMI SEMICONDUCTOR – I2C Microstepping Motordriver

AMIS-30624 I²C Microstepping Motordriver
Data Sheet
Table 6: AC Parameters (cont.)
Switch Input and Hardwire Address Input
T_sw
T_{sw_on}
SWI ^{Scan pulse period (5)}
HW _{Scan pulse duration}
1024
µs
128
µs
Motordriver
F_pwm
PWM frequency ⁽⁵⁾
PWMfreq = 0 ⁽⁶⁾
PWMfreq = 1 ⁽⁶⁾
20.6
22.8
25.0
kHz
41,2
45,6
50,0
kHz
F_{jit_depth}
T_brise
T_bfall
PWM jitter modulation depth
MOTxx
Turn-on transient time
Turn-off transient time
PWMJen = 1 ⁽⁶⁾
Between 10% and 90%
10
%
170
ns
140
ns
T_stab
Run current stabilization time
29
32
35
ms
Charge Pump
f_CP
CPN
CPP
Charge pump frequency ⁽⁵⁾
250
kHz
Notes:
(1) The maximum number of connected I²C devices is dependent on the number of available addresses and the maximum bus capacitance to still guarantee the rise
and fall times of the bus signals.
(2) An I²C device must internally provide a hold time of at least 300ns for the SDA signal (referred to the V_IHmin of the SCL signal) to bridge the undefined region of the
falling edge of SCL.
(3) The maximum t_HD,DAT has only to be met if the device does not stretch the LOW period (t_LOW) of the SCL signal.
(4) A Fast-mode I²C-bus device can be used in a standard-mode I²C bus system, but the requirement t_SU,DATA ≥ 250ns must than be met. This will automatically be the
case if the device does not stretch the LOW period of the SCL signal. If such a device does stretch the LOW period of the SCL signal, it must output the next data
bit to the SDA line t_rmax + t_SU,DATA = 1000 + 250 = 1250ns (according to the standard-mode I²C-bus specification) before the SCL line is released.
(5) Derived from internal oscillator.
(6) See SetMotorParam and PWM regulator.
SDA
START
V_IHmin
t_F
t_HD,START
SCK
V_ILmax
t_R
t_HD,DATA
t_LOW
REPEATED START
t_SU,DATA
t_SU,START
t_HIGH
Figure 5: I²C Timing Diagrams
STOP
START
t_SP
t_SU,STOP
t_BUF
PC20060925.8
AMI Semiconductor – Apr. 2007, Rev 3.1, M-20664-003
11
www.amis.com