MAX6966 Maxim, MAX6966 Datasheet - Page 22

• Manufacturer Part Number: MAX6966
• Description: The MAX6966/MAX6967 serial-interfaced peripherals provide microprocessors with 10 I/O ports rated to 7V
• Manufacturer: Maxim

Alternatively, the MAX6966/MAX6967s can be daisy-
chained by connecting the DOUT of one device to the
DIN of the next, and driving SCLK and CS lines in paral-
lel
MAX6967s to be read. Data at DIN propagates through
the internal shift registers and appears at DOUT 15.5
clock cycles later, clocked out on the falling edge of
SCLK. When sending commands to daisy-chained
MAX6966/MAX6967s, all devices are accessed at the
same time. An access requires (16 x n) clock cycles,
where n is the number of MAX6966/MAX6967s connect-
10-Port Constant-Current LED Drivers and I/O
Expanders with PWM Intensity Control
Figure
Figure
22
(Figure
______________________________________________________________________________________
9. MAX6966/MAX6967 Daisy-Chain Connection
10. Timing Diagram
DOUT
SCLK
DIN
CS
9). This connection allows the MAX6966/
µC
MOSI
SCLK
MISO
CS
t
CSS
t
DS
D15
t
DIN
SCLK
CS
DH
MAX6966
MAX6967
t
CL
D14
DOUT
t
CH
ed together. For daisy-chaining to work, DOUT/OSC
must be configured as DOUT by clearing configuration
register bit D7 to zero
powers up with DOUT/OSC configured as DOUT output
by default, while the MAX6967 powers up with
DOUT/OSC configured as OSC input by default. The
serial-interface speed (maximum SCLK) is limited to
17.5MHz when multiple devices are daisy-chained due
to the DOUT propagation delay and DIN setup time.
Figure
DIN
CS
SCLK
D1
10 is the timing diagram.
MAX6966
MAX6967
t
CP
t
DO
DOUT
D0
t
CSH
(Table
t
CSW
SCLK
DIN
CS
4). Note that the MAX6966
MAX6966
MAX6967
D15
DOUT