AS5245-HQFT-500 austriamicrosystems, AS5245-HQFT-500 Datasheet - Page 14

• Manufacturer Part Number: AS5245-HQFT-500
• Description: IC ENCODER ROTARY 32-QFN
• Manufacturer: austriamicrosystems
• Type: Linear, Rotary Encoder - Programmabler

Specifications of AS5245-HQFT-500

• Featured Product: AS5245 – Dual Die Motion Sensing IC
• Sensing Range: 45mT ~ 75mT
• Voltage - Supply: 3 V ~ 3.6 V, 4.5 V ~ 5.5 V
• Current - Supply: 21mA
• Current - Output (max): 4mA
• Output Type: Quadrature with Index (Incremental)
• Features: Programmable
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 32-VQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AS5245-HQFT-500TR

AS5245
Data Sheet - D e t a i l e d D e s c r i p t i o n
Incremental Output Validity.
CSn is low (internal Pull Up) the first time. In quadrature mode A = B = Index = high indicates an invalid output. If the interpolator recognizes a
difference larger than 128 steps between two samples, it holds the last valid state. The interpolator synchronizes up again with the next valid
difference. This avoids undefined output burst, e.g. if no magnet is present.
8.2.4 Sync Mode
This mode is used to synchronize the external electronic with the AS5245. In this mode, two signals are provided at the pins DTEST1_A and
DTEST2_B. By setting of Md0=1 and Md1=1 in the OTP register, the Sync mode will be activated.
Figure 8. DTest1_A and DTest2_B
Every rising edge at DTEST1_A indicates that new data in the device is available. With this signal it is possible to trigger an external customer
Microcontroller (interrupt) and start the SSI readout. DTEST2_B indicates the phase of available data.
8.2.5 Sine/Cosine Mode
This mode can be enabled by setting the OTP Factory-bit FS2. If this mode is activated, the 16 bit sinus and 16 bit cosines digital data of both
channels will be switched out. Due to the high resolution of 16 bits of the data stream, an accurate calculation can be done externally. In this
mode, the open drain outputs of DTEST1_A and DTEST2_B are switched to push-pull mode. At Pin MagDECn the clock impulse, at Pin
MagINCn the Enable pulse will be switched out. The pin PWM indicates, which phase of signal is being presented. The mode is not available in
the default mode.
8.2.6 Daisy Chain Mode
The Daisy Chain mode allows connection of several AS5245s in series, while still keeping just one digital input for data transfer (see “Data IN” in
Figure
serial data of all connected devices is read from the DO pin of the first device in the chain. The length of the serial bit stream increases with every
connected device, it is n * (18+1) bits: n= number of devices. E.g. 38 bit for two devices, 57 bit for three devices, etc.
The last data bit of the first device (Parity) is followed by a dummy bit and the first data bit of the second device (D11), etc.
Figure 9. Daisy Chain Hardware Configuration
www.austriamicrosystems.com/AS5245
9). This mode is accomplished by connecting the data output (DO; pin 9) to the data input (PDIO; pin 8) of the subsequent device. The
DTest1_A
DTest1_B
µC
During power on the incremental output is kept stable high until the offset compensation is finished and the
Data IN
CLK
CSn
DO
CSn
AS5245
Top Die
400µs (100µs)
PDIO
CLK
Revision 1.5
DO
CSn
Bottom Die
AS5245
PDIO
CLK
DO
CSn
AS5245
Top Die
PDIO
CLK
(see Figure
10).
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