AS5045

Data Sheet

www.austriamicrosystems.com

Revision 1.7

15 – 33

Table 5.

Magnetic Field Strength Red-yellow-green Indicator (OTP option)

Status Bits

Hardware Pins

OTP: Mag CompEn = 1 (red-yellow-green programming

option)

Mag

INC

Mag

DEC

LIN

Mag

INCn

Mag

DECn

Description

0

0

0

Off

Off

No distance change

Magnetic input field OK (GREEN range, ~45…75mT)

1

1

0

On

Off

YELLOW range: magnetic field is ~ 25…45mT or ~75…135mT. The

AS5045 may still be operated in this range, but with slightly reduced

accuracy.

1

1

1

On

On

RED range: magnetic field is ~<25mT or >~135mT. It is still possible to

operate the AS5045 in the red range, but not recommended.

All other combinations

n/a

n/a

Not available

Note: Pin 1 (MagINCn) and pin 2 (MagDECn) are active low via open drain output and require an external pull-up

resistor. If the magnetic field is in range, both outputs are turned off.

The two pins may also be combined with a single pull-up resistor. In this case, the signal is high when the magnetic

field is in range. It is low in all other cases (see Table 4 and Table 5).

8.2

Daisy Chain Mode

The Daisy Chain mode allows connection of several AS5045’s in series, while still keeping just one digital input for

data transfer (see “Data IN” in Figure 6 below). This mode is accomplished by connecting the data output (DO; pin 9)

to the data input (PROG; pin 8) of the subsequent device. An RC filter must be implemented between each PROG

pin of device n and DO pin of device n+1, to prevent then encoders to enter the alignment mode, in case of ESD

discharge, long cables, not conform signal levels or shape. Using the values R=100R and C=1nF allow a max. CLK

frequency of 1MHz on the whole chain. The 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:

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… (see Figure 7)

Figure 6. Daisy Chain Hardware Configuration