Rev.1.1
_00
PROGRAMMABLE PORT CONTROLLER
(PORT EXPANDER WITH BUILT-IN E
2
PROM CIRCUIT)
S-7750C
The S-7750C is a programmable port controller IC comprised of an
E
2
PROM, a control circuit for data output, a circuit to prevent
malfunction caused by low power supply voltage and others.
This IC operates at 400 kHz and interfaces with exteriors via
I
2
C-bus. Using a serial signal, users can control both of the 8ch
digital output “H” or “L” and delay time which can be set at each
channel.
For the digital output pins at the 8 channels, the default value and
inverted delay time are settable at each port. This IC is effective to
control ON / OFF the chips surrounding MPU. And this IC
maintains the default value for control despite power-off due to the
included E
2
PROM.
Features
•
•
•
•
•
•
•
•
•
•
•
Operating voltage range:
2.3 to 4.5 V
8ch digital output
Operating frequency of I
2
C-bus interface:
400 kHz
Function to prevent malfunction during low power supply voltage operation
Low current consumption at standby:
3.0
µA
Max. (V
CCH
= 4.5 V)
2
Built-in E PROM circuit
2
10
5
cycles / word
*1
(at
−40
to
+85 °C)
E PROM endurance:
E
2
PROM data retention:
10 years (after rewriting 10
5
cycles / word)
Function to protect Write in E
2
PROM
Lead-free product
Small package:
WLP-16A
*1.
For each address (Word: 8-bit)
Application
•
•
•
•
Mobile phone
Portable communication device
Digital still camera
Digital video camera
Package
Package Name
WLP-16A
Drawing Code
Package
HA016-A
Tape
HA016-A
Reel
HA016-A
Seiko Instruments Inc.
1
PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E
2
PROM CIRCUIT)
Rev.1.1
_00
S-7750C
General Description of Pin Function
1. SDA (Serial data I/O) pin
The SDA pin transmits serial data bi-directionally, is comprised of a signal input pin and a pin with Nch transistor open
drain output. In use, generally, connect the SDA line to any other device which has the open-drain or open-collector
output with Wired-OR connection by pulling up to V
CCH
by a resistor.
2. SCL (Input for serial clock) pin
The SCL pin is an input pin for serial clock, processes a signal at a rising / falling edge of SCL clock. Pay attention
fully to the rising / falling time and comply with specifications.
3. WP (Input for Write protect) pin
This pin performs Write Protect to E
2
PROM (This pin does not have a function for Write protect to the register).
Set the WP pin in V
CCH
when using the Write Protect function. If not, set the WP pin to GND.
4. TIMEN (Input for timer enable) pin
This pin controls enable (“H”) /disable (“L”) / start (“L”→”H”) in the timer action (inversion of digital output due to
elapsed period). Regarding the timer action, refer to “
Command”
and “
Condition to start timer, Port Output
and Register”.
When raising VCCH and TIMEN simultaneously, set V
CCH
≥
2.5 V.
5. CLK (Input for external clock) pin
As primary clock in the circuit action, users are able to use clock either from the internal oscillation circuit or input it
externally by option. Users can input clock from this pin in case of using external clock. If not, connect this pin to
VCCH or GND.
6. DO7 to DO0 (Digital output) pin
These pins are for the digital output port. Their values are equal to the ones of a control port register during output. Its
output inverts after; the timer starts and delay time has elapsed. Regarding the timer action, refer to “
Command”
and “
Condition to start timer, Port Output and Register”.
7. VSS pin
Connect to GND.
8. VCCH pin
Except for the output ports, the power supply is applied to the entire circuit via this pin. Regarding the voltage’s value
to be applied to this pin, refer to “
Recommended Operating Conditions”.
9. VCCL pin
This pin is to apply the power supply for the output ports. Regarding the voltage’s value to be applied to this pin, refer
to “
Recommended Operating Conditions”.
4
Seiko Instruments Inc.
PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E
2
PROM CIRCUIT)
Rev.1.1
_00
S-7750C
Equivalent Circuit of I/O Pin
This IC’s I/O pin does not have an element of pull-up or pull-down. The SDA line has an open drain output. The
followings are equivalent circuits.
SCL, TIMEN, CLK
Figure 3 SCL, TIMEN, CLK Pin
SDA
Open drain output
Figure 4 SDA Pin
WP
Figure 5 WP Pin
VCCL
DO
Figure 6 DO Pin and VCCL Pin
Seiko Instruments Inc.
5
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