AMIS-30624 Datasheet, PDF (22/56 Pages) AMI SEMICONDUCTOR – I2C Microstepping Motordriver

AMIS-30624
14.2 Main Control and Register, OTP Memory + ROM
14.2.1. Power-up Phase
The power-up phase of the AMIS-30624 will not exceed 10ms. After this phase, the AMIS-30624 is in shutdown mode, ready to receive
I²C messages and execute the associated commands. After power-up, the registers and flags are in the reset state; some of them
being loaded with the OTP memory content (see Table 18).
14.2.2. Reset State
After power-up, or after a reset occurrence (e.g. a micro cut on pin VBB has made Vdd go below VddReset level), the H-bridges will be
in high impedance mode, and the registers and flags will be in a predetermined position. This is documented in Table 18 and Table 19.
14.2.3. Soft Stop
A soft stop is an immediate interruption of a motion, but with a deceleration phase. At the end of this action, the register TagPos is
loaded with the value contained in register ActPos to avoid an attempt of the circuit to achieve the motion (seeTable 18). The circuit is
then ready to execute a new positioning command, provided thermal and electrical conditions allow for it.
14.2.4. Thermal Shutdown Mode
When thermal shutdown occurs, the circuit performs a SoftStop command and goes to motor shutdown mode (see Figure 15).
14.2.5. Temperature Management
The AMIS-30624 monitors temperature by means of two thresholds and one shutdown level, as illustrated in the Figure 15. The only
condition necessary to reset flags <TW> and <TSD> (respectively thermal warning and thermal shutdown) is when the temperature is
lower than T_tw causing the occurrence of a GetFullStatus1 I²C frame.
T° < T_low
<Tinfo> = '01'
<TW> = '0'
<TSD> = '0'
PC20070219.1
LOW
TEMP
<Tinfo> = '01'
<TW> = '0'
<TSD> = '0'
T° > T_low
T° < Ttw
& I²C frame
<GetFullStatus1>
<Tinfo> = '01'
<TW> = '0'
<TSD> = '0'
POST
THERMAL
SHUTDOWN
2
<Tinfo> = '01'
<TW> = '0'
<TSD> = '0'
NORMAL
TEMP
T° < Ttw
& I²C frame
<GetFullStatus1>
POST
THERMAL
WARNING
T° > Ttw
<Tinfo> = '01'
<TW> = '0'
<TSD> = '0'
T° < T_tw
THERMAL
WARNING
T° > Ttw
T° > T_tsd
T° > Ttw
T° < T_tw
<Tinfo> = '01'
<TW> = '0'
<TSD> = '0'
POST
THERMAL
SHUTDOWN
1
T° > T_tsd
T° < Ttsd
Figure 15: State Diagram Temperature Management
THERMAL
SHUTDOWN
Tinfo> = '01'
TW> = '0'
TSD> = '0'
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