ACS8514 Semtech Corporation, ACS8514 Datasheet - Page 26

• Manufacturer Part Number: ACS8514
• Description: Synchronous Equipment Timing Source Partner IC for 2nd T4 Dpll, Accurate Monitoring & Input Extender
• Manufacturer: Semtech Corporation

Serial Mode
In SERIAL Mode, the device is configured to interface with a serial microprocessor bus. Figure 11 and Figure 12 show
the timing diagrams of write and read accesses for this mode. The serial interface can be SPI compatible.
The Motorola SPI convention is such that address and data is transmitted and received MSB first. On the ACS8514,
device address and data are transmitted and received LSB first. Address, read/write control and data on the SDI pin is
latched into the device on the rising edge of the SCLK. During a read operation, serial data output on the SDO pin can be
read out of the device on either the rising or falling edge of the SCLK depending on the logic level of CLKE. For standard
Motorola SPI compliance, data should be clocked out of the SDO pin on the rising edge of the SCLK so that it may be
latched into the microprocessor on the falling edge of the SCLK.
The serial interface clock (SCLK) is not required to run between accesses (i.e., when CSB = 1).
Figure 11 Read Access Timing in SERIAL Mode
Table 16 Read Access Timing in SERIAL Mode (For use with Figure 11 )
Revision 3.00 April 2007 © Semtech Corp.
ADVANCED COMMS & SENSING
Symbol
t
t
t
t
su1
su2
d1
d2
Setup SDI valid to SCLK
Setup CSB
Delay SCLK
Delay CSB
rising edge
falling edge
rising edge
to SDO high-Z
to SCLK
(SCLK
rising edge
falling edge
rising edge
Parameter
for CLKE = 1) to SDO valid
Page 26
FINAL
ACS8514 SETS Buddy
14 ns
4 ns
MIN
-
-
TYP
-
-
-
-
DATASHEET
www.semtech.com
18 ns
16 ns
MAX
-
-