AS5030-ATSU austriamicrosystems, AS5030-ATSU Datasheet - Page 32

• Manufacturer Part Number: AS5030-ATSU
• Description: IC ENCODER ROTARY 8-BIT 16-TSSOP
• Manufacturer: austriamicrosystems
• Type: Linear, Rotary Encoder - Programmabler

Specifications of AS5030-ATSU

• Sensing Range: 23.6mT ~ 44.5mT
• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 14mA
• Current - Output (max): 4mA
• Output Type: Digital, PWM
• Features: Programmable
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 16-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Hys = 1.
The differentiator between Low Power Mode and Ultra Low Power Mode is the current consumption and the wake-up time to switch back to
active operation.
In both Reduced Power Modes, the AS5030 is inactive. The last state, e.g. the angle, AGC value, etc. is frozen and the chip starts from this
frozen state when it resumes active operation. This method provides much faster start-up than a “cold start” from zero. If the AS5030 is cycled
between active and reduced current mode, a substantial reduction of the average supply current can be achieved. The minimum dwelling time in
active mode is the wake-up time. The actual active time depends on how much the magnet has moved while the AS5030 was in reduced power
mode. The angle data is valid, when the status bit LOCK has been set. Once a valid angle has been measured, the AS5030 can be put back to
reduced power mode. The average power consumption can be calculated as:
Where:
I
I
I
t
t
Example: Ultra Low Power Mode; sampling period = one measurement every 10ms.
System constants = I
See
Reducing Power Supply Peak Currents.
An optional RC-filter (R1/C1) may be added to avoid peak currents in the power supply line when the AS5030 is toggled between active and
reduced power mode. R1 must be chosen such that it can maintain a VDD voltage of 4.5V ~ 5.5V under all conditions, especially during long
active periods when the charge on C1 has expired. C1 should be chosen such that it can support peak currents during the active operation
period. For long active periods, C1 should be large and R1 should be small.
www.austriamicrosystems.com/AS5030
I
avg
active
power_down
on
off
Ultra Low Power Mode
avg
:time period during which the chip is operated in active mode
: time period during which the chip is in reduced power mode
Low Power Mode
Figure 27
average current consumption
Active operation
: current consumption in active mode
1. Wait for CPU interrupt or delay for next angle read (typ. <3ms in LP mode, typ>3ms in ULP mode)
2. Wake up (PSM = 0)
3. Wait 0.01ms (Low Power Mode)
4. Check if Lock = 1 then read angle
5. Enable Low Power Mode or Ultra Low Power Mode (PSM=1)
6. Return to 1
=
(No hysteresis)
Mode
I
:current consumption in reduced power mode
active
for an overview table of the average current consumption in the various reduced power modes.
∗
t
active
on
t
+
on
= 14mA, I
Current Consumption
I
+
power
t
off
power_down
_
1.4 mA
14 mA
30 µA
(typ.)
down
I
avg
∗
=
t
= 30µA, ton(min) = 500µs (startup from Ultra Low Power Mode):
off
14
mA
sampling interval = t
Wake-up Time to Active
3.8 ms (with locked AGC)
1.0 ms (without AGC)
∗
500
500
Operation
0.15 ms
0.5 ms
μ
μ
s
s
Revision 2.1
+
+
9
30
5 ,
μ
ms
on
A
*
+ t
9
off
5 ,
ms
=
729
μ
A
32 - 44
(EQ 6)
(EQ 7)