XRP7714 Exar, XRP7714 Datasheet - Page 22

• Manufacturer Part Number: XRP7714
• Description: Quad Channel Digital PWM Step Down Controller
• Manufacturer: Exar

P
Each switching channel is configured to run with a phase shift of 90 degrees.
GPIO P
The General Purpose Input Output (GPIO) Pins are the basic interface between the XRP7714 and
the system. Although all of the stored data within the IC can be read back using the I2C bus it is
sometimes convenient to have some of those internal register to be displayed and or controlled by
a single data pin. Besides simple input output functions the GPIO pins can be configured to serve
as external clock inputs. These pins can be programmed using OTP bits or can be programmed
using the I
functions that the GPIO can be programmed to do.
NOTE: the GPIO Pins (and all I/Os) should NOT be driven without a 10K resistor when VIN is not
being applied to the IC.
The polarity of the GPIO pin can be set by using the GPIO_ACT_POL register. This register allows
any GPIO pin whether configured as an input or output to change polarity. Bits [5:0] are used to
set the polarity of GPIO 0 though 5. If the IC operates in I
[5:4] are ignored.
© 2010 Exar Corporation
GPIO Pins Polarity
HASE
S
INS
HIFT
2
C bus. This GPIO_CONFIG register allows the user close to 100 different configuration
CLK_IN
CLK_IN
Fig. 29:Alternative External clock synchronization Master Slave combination
Fig. 28: External Clock Synchronization Master Slave Combination
external clock sync
external clock sync
GPIO1
GPIO3
Configured as a
Configured as a
master with
master with
Q
Q
XRP7714
XRP7714
u
u
a
a
GPIO1
d
d
GPIO2
GPIO2
C
C
h
h
CLK_OUT
a
a
SYNC_OUT
SYNC_OUT
22/27
n
n
n
n
e
e
l
l
D
D
i
i
g
g
i
i
SYNC_IN
SYNC_IN
t
t
CLK_IN
CLK_IN
a
a
2
C mode, then the commands for Bits
l
l
P
P
W
W
GPIO2
GPIO2
GPIO1
GPIO1
M
M
configured
configured
XRP7714
XRP7714
S
S
as slave
as slave
t
t
e
e
p
p
D
D
o
o
w
w
n
n
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X
X
C
C
R
R
o
o
P
n
P
n
Rev. 1.1.3
t
t
7
7
r
r
o
o
7
7
l
l
1
1
l
l
e
e
4
4
r
r