EQ0321 Datasheet, PDF (12/20 Pages) Asahi Kasei Microsystems – Programmable linear Hall IC for 1 axis

[EQ0321]
CSN
SCK
SI
SO
123456 78
0 0 0 0×1 0 0
Hi-Z
×_×=₌ド_Dン_oト_n’・_tケ_caア_re
Figure 12. WRDI command
- 10.3.2 WRITE command
WRITE instruction can start the WRITE function to EEPROM.
After CSN pin changes high to low, operation code, address and data are entered from SI pin. After the
instruction input, the internal programming cycle starts when CSN pin changes low to high. After the
instructions are entered, CSN pin should change low to high after waiting EEPROM Program Time “tWR”
and before next SCK clock rises.
After WRITE instruction, the EQ0321 changes to Write Disable status automatically. theEQ0321 needs
WREN instruction before every WRITE instruction. When WRITE instruction is done while the EQ0321 is
in Write Disable status, WRITE instructions are ignored and the EQ0321 becomes standby status after CSN
changes to high. The EQ0321 can accept the next instruction after CSN becomes low.
CSN
SCK
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
SI
O7 O6 O5 O4 O3 O2 O1 O0 A7 A6 A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0
SO
Hi-Z
O7-O0: Operation Code, A7-A0：Address, D7-D0：Data
Figure 13. WRITE sequence
- 10.3.3 READ command
After CSN changes high to low, the operation code and address are sent on SI pin and the data (D7-D0) outs
from SO pin. SI signal is ignored after a final bit (A0) is entered.
CSN
SCK
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
SI
O7 O6 O5 O4 O3 O2 O1 O0 A7 A6 A5 A4 A3 A2 A1 A0
SO
Hi-Z
Hi-Z
D7 D6 D5 D4 D3 D2 D1 D0
O7-O0: Operation Code, A7-A0：Address, D7-D0：Data
MS1436-E-00
Figure 14. READ command
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2013/04