Datasheet

TMC429 DATASHEET (v. 1.07 / 2012-AUG-01) 57
Copyright © 2010-2012, TRINAMIC Motion Control GmbH & Co. KG
19 Power-On-Reset
The TMC429 is equipped with a static and dynamic reset with internal hysteresis (see Figure 19-1). So,
it performs an automatic reset during power-on. If the power supply voltage goes below a threshold, an
automatic power on reset is performed also. The power on reset time tRESPOR also depends on the
power up time of the on-chip voltage regulator (see Table 18-1 ).
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VDD
Power supply range
3.0
3.3
3.6
V
Temp
Temperature
-55
25
125
°C
Vop
Reset on/off
0.80
V
Voff
Reset off
1.58
2.13
2.85
V
Von
Reset on
1.49
1.98
2.70
V
tRESPOR
Reset time of on-chip power-on-reset
2.14
3.31
5.52
µs
Table 19-1: Characteristics of the on-chip power-on-reset
Voff
Von
Vop
0
Voff
Von
Vop
0
static dynamic
tRESPOR
Figure 19-1: Operating principle of the power-on-reset