ADBM-A350 Avago Technologies US Inc., ADBM-A350 Datasheet - Page 14

• Manufacturer Part Number: ADBM-A350
• Description: Vigor Colossus OFN Module
• Manufacturer: Avago Technologies US Inc.

Specifications of ADBM-A350

• Output Current: 20mA
• Sensor Output: SPI / TWI
• Supply Voltage Range Dc: 1.65V To 3.3V
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Read Operation
A read operation, defi ned as data going from the ADBM-A350 to the micro-controller, is always initiated by the micro-
controller and consists of two bytes. The fi rst byte contains the address, is sent by the micro-controller over MOSI, and
has a “0” as its MSB to indicate data direction. The second byte contains the data and is driven by the ADBM-A350 over
MISO. The sensor outputs MISO bits on falling edges of SCLK and samples MOSI bits on every rising edge of SCLK.
Figure 8. Read Operation
Figure 9. MISO Delay and Hold Time
Required timing between Read and Write Commands
There are minimum timing requirements between read and write commands on the serial port.
Figure 10. Timing between two write commands
If the rising edge of the SCLK for the last data bit of the second write command occurs before the required delay (t
then the fi rst write command may not complete correctly.
Figure 11. Timing between write and read commands
14
NCS
SCLK
Cycle #
SCLK
MOSI
MISO
t
SCLK
SCLK
DLY-MISO
SCLK
MISO
1
0
t
Address
Address
r-MISO
2
A
6
D
0
Write Operation
Write Operation
A
3
t
5
HOLD-MISO
Do not care
4
A
4
t
f-MISO
5
A
3
Data
Data
6
A
2
NOTE: The 0.5/f
MISO data hold time of the ADBM-A350. Since the falling edge of
SCLK is actually the start of the next read or write command, the
ADBM-A350 will hold the state of data on MISO until the falling edge
of SCLK.
7
A
1
A
0
8
SCLK
9
D
7
minimum high state of SCLK is also the minimum
t
SRAD delay
Address
10
D
6
t
t
SWR
SWW
Write Operation
11
D
5
12
D
4
13
D
3
Address
Next Read
Operation
Data
14
D
2
15
D
1
16
D
0
SWW
),