AK7401 Datasheet, PDF (12/29 Pages) Asahi Kasei Microsystems – Rotary Position Sensor IC

[AK7401]
● Data sequence
1) Store Data
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OP[3:0]
ADDR[6:0]
*
DATA[11:0]
OP[3:0]: “0001” (to EEPROM), “0011”(to Register)
ADDR[6:0]: Register or EEPROM address number(See Address map)
DATA[11:0]: 12-bit data to store
(*: Don’t care)
The configuration of EEPROM data has triple redundancy. When a data is written to a specific EEPROM
address (0x03 to 0x0B, 0x0D) via WriteEEPROM operation code, the stored data is triply copied to other
particular address automatically.
2) Read Data
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OP[3:0]
ADDR[6:0]
Z
DATA[11:0]
OP[3:0]: “0010” (from EEPROM), “0100” (from Register)
ADDR[6:0]: Register or EEPROM address number (See Address map)
DATA[11:0]: 12-bit data to read
Z: Hi-Z
3) Read Angle Data
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1001
*
Z P1 P2 E
R_ANG[11:0]
OP[3:0]: “1001”
R_ANG[11:0]: 12-bit angle data
P1: Parity bit for R_ANG[11:6]
P2: Parity bit for R_ANG[5:0]
E: Error bit for all valid self-diagnosis
Z: Hi-Z
(*: Don’t care)
4) Change Mode
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01010000010 *
R_CHMD[11:0]
OP[3:0]: “0101”
ADDR[6:0]: “0x02”
R_CHMD[11:0]: “0x50F” (User Mode), “0x000” (Normal Mode)
(*: Don’t care)
5) Soft Reset
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01101001110
*
OP[3:0]: “0110”
ADDR[6:0]: “0x4E”
(*: Don’t care)
014002685-E-01
- 12 -
2015/07