SMB380 Jennic, SMB380 Datasheet - Page 20

• Manufacturer Part Number: SMB380
• Description: Smb380 Triaxial Acceleration Sensor
• Manufacturer: Jennic

3.3 Control registers
All single control bits are active at 1.
3.3.1 Reset_INT
This interrupt (address 0Ah, bit 6) is reset (interrupt pad goes to low) each time this bit is written
to 1.
3
W
EEPROM content is copied to image registers. The bit update_image is turned at 0 whe
procedure is finished. No write or read to image registers a
th
r
Th
n i
3
ee_w (address 0Ah, bit 4) is used to enable/disable the access to default setting registers.
This bit must first be written to 1 to enable write access to 16h to 3D and to enable read access
to 16h to 22h. When this bit is at 0, any access to addresses from 16h to 7Fh has no effect; any
read to these addresses set SDO to tri-state (4-wire SPI) or SDI to tri-state (3-wire SPI and I²C).
This is valid for all serial interface (I²C, SPI 3-wire or SPI 4-wire).
I²C acknowledgement procedure for access to non-protected or blocked memory regions:
- I²C slave address:
- I²C register address (I²C write):
- I²C write data (I²C write):
- I²C read data (I²C read):
After power on reset ee_w=0. So EEPROM and all addresses from 16h to 7Fh can not be
directly written or read.
Rev. 1.3
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copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
7211RB11
e
.3.2 Update_image
.3.3 Ee_w
terface configuration may have to be updated.
eir up
set a
hen
e update_image procedure may overwrite the SPI4 setting (section 3.1.1). Thus the correct
. Specifications are subject to change without notice.
nd after soft_reset has been written to 1.
this bit (address 0Ah, bit 5) is set at 1, an image update procedure is starte
date from EEPROM. An automatic update image procedure also occurs after pow
Triaxial acceleration sensor
Preliminary Data Sheet
acknowledge is set by master; no error detection is
possible; SDI is set to Hi-Z for protected register (0xFF is
sent)
if correct, the SMB380 sets acknowledge.
The SMB380 sets acknowledge for both unprotected and
protected registers.
The SMB380 sets acknowledge for both unprotected and
protected resisters; no write is done for protected register.
SMB380
Page 20
nd EEPROM write is allowed during
Bosch Sensortec
18-September-2007
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