Bosch MAN-REG-X-08 Especificaciones descargar pdf (Pagina 42)

Data sheet

BMA220

Page 42

BST-BMA220-DS003-08 | Revision 1.15 | August 2011 Bosch Sensortec

third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.

Note: Specifications within this document are subject to change without notice.

Table 20: SPI Timing

Parameter Symbol Condition Min Units

CSB lead time T_setup_csb 10

CSB lag time T_hold_csb 10

SDI setup time T_setup_sdi 5

SDI hold time T_hold_sdi 5

SDO delay time T_delay_sdo C

Load

≤ 50pF 30 (MAX)

SCK period T_sck 100

3-wire SPI

3-wire SPI interface uses SDI pin for both data input and output. It can be invoked by setting the

SPI3 register bit at address 0x0F.

The write command for the 3-wire SPI is identical to the 4-wire SPI write command. When a

read command is performed, output data are redirected to SDI pin after last address bit AD0 is

latched. No extra clock cycle is needed for output redirection.

Output data are synchronized at falling edge of SCK. Both input and output data shall be

captured at rising edge of SCK.

CSB

SCK

SDI

R/W AD6 AD5 AD4 AD3 AD2 AD1 AD0

SDO

DO2 DO0 DO4 DO3 DO1 DO5 DO7 DO6

tri-state

Figure 18: 3-wire SPI read protocol

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 62 63

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Bosch MAN-REG-X-08 Especificaciones Pagina 42