A31316 datasheet(56/61 Pages) ALLEGRO

56 / 61 page

3D Magnetic Position Sensor IC

A31316

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

EEPROM 0x39 / Shadow 0x79

SENT_FRAME_RATE (BITS 23:22)

Sets the frame rate when using paused SENT.

sent_frame_rate

Frame Rate including pause pulse

3 data nibbles: frame length 210 ttick

4 data nibbles: frame length 228 ttick

6 data nibbles: frame length 282 ttick

0.5 ms

1.0 ms

2.0 ms

SENT_INIT_SEL (BITS 21:19)

Selects which data the SENT interface will transmit during the

initialization time. If no initialization time is selected this register

does nothing.

sent_init_sel

n-bit data Output

2n – 7

2n – 4

2n – 3

2n – 2

2n – 1

SENT_ENCODING_SEL (BIT 18)

Selects SENT data mapping for SENT configurations 0, 4, 7, and 15.

• If sent_encoding_sel = ‘0’, mapping is disabled, SENT will

output the data as it appears in the registers.

• If sent_encoding_sel = ‘1’, output SENT data is remapped per

the table below.

DATA Value

SENT Output

1 through 2n-8

Unchanged

>=2n-8

2n-8

SCN 1 Error flag

2n-5

SCN 2 Error flag

2n-6

Not Valid

* n is the number of bits in the data of the SENT packet.

** Not valid refers to the period of time after power up before the

SENT interface receives the first valid update from the signal path.

SENT_CRC_SEL (BIT 17)

Includes the SCN nibble in the CRC calculations when set.

SENT_EMSG_DIS (BIT 16)

Disables SENT serial message when set.

DIG_OUT_PULL_LIM_DIS (BIT 15)

Disables slew rate control when set.

DIG_OUT_PULL_LIM (BITS 14:12)

Selects the slew rate control for digital drivers.

DIG_OUT_DATA_RATE (BITS 11:7)

Selects the tick time if using SENT interface, or the period when

using the PWM interface.

SENT_DATA_SEL (BITS 6:3)

Selects the SENT data configuration.

DIG_COMM_ID (BIT 2)

Sets the device ID for Manchester communication protocol.

DIG_OUT_SEL (1:0)

Selects the output mode for digital interface devices.

dig_out_sel

Output Protocol

PWM

SENT

SENT with Pause Pulse

PWM

EEPROM 0x3A / Shadow 0x7A

SENT_EMSG_ERR_REPEAT (BIT 21)

Enables SENT message repeat when set.

SENT_EMSG_SEL (BITS 20:0)

Selects which EMSG messages will be sent.

EEPROM 0x3B / Shadow 7B

ENHANCED_SETTINGS_UNLOCK (BIT 25)

Enables write access to register 0x16 when set.

SPARE_0X3B (BITS 24:23)

Spare bits that can be used as non-volatile storage within the

device. This register has no effect on device performance.

A31316 Datasheet(PDF) 56 Page - Allegro MicroSystems

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