Rev.1.3
_00
PROGRAMMABLE PORT CONTROLLER
(PORT EXPANDER WITH BUILT-IN E
2
PROM CIRCUIT)
S-7760A
The S-7760A 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, controls an 8ch digital output with a serial signal.
Among the digital output ports of 8 channels, the lower 4 channels
have a timer function so that at each port, users are able to set the
default value and inverted delay time. In the higher 4 channels,
setting the fixed output is available at each port. The default value
is maintained despite power-off because this IC has an E
2
PROM.
The S-7760A is able to be used to control ON/OFF for the chips
surrounding MPU and to output the default data that devices
fundamentally have.
Features
•
•
•
•
Operating voltage range:
8ch digital output:
Operating frequency of I
2
C-bus interface:
Low current consumption at standby:
2.3 to 4.5 V
Higher 4 channels; fixed output/lower 4 channels; timer action
400 kHz
3.0
µA
Max. (V
CCH
= 4.5 V CMOS input type)
10.0
µA
Max. (V
CCH
= 4.5 V low voltage input type)
6-byte
10
5
cycles / word
*1
(at
−40
to
+85 °C)
10 years (after rewriting 10
5
cycles / word)
•
Built-in E
2
PROM circuit:
2
•
E PROM endurance:
2
•
E PROM data retention:
•
Function to protect write in E
2
PROM
•
Function to prevent malfunction during low power supply voltage operation
•
Lead-free product
•
Small package:
WLP-16A, 16-Pin TSSOP (Under development)
*1.
For each address (Word: 8 bits)
Application
•
•
•
•
Mobile phone
Portable communication device
Digital still camera
Digital video camera
Package
Package Name
WLP-16A
16-Pin TSSOP
*1
Drawing Code
Package
HA016-A
FT016-A
Tape
HA016-A
FT016-A
Reel
HA016-A
FT016-A
*1.
Under development
Seiko Instruments Inc.
1
PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E
2
PROM CIRCUIT)
Rev.1.3
_00
S-7760A
Pin Configuration
WLP-16
Bottom View
SCL
A1
CLK or BPDX
B1
DO7
C1
D1
DO5
A2
SCL
B2
VSS
C2
D2
DO4
A3
WP
B3
SDA
C3
D3
VCCL
A4
VCCH
B4
DO0
C4
DO1
D4
DO2
16-Pin TSSOP
*1
Top View
1
16
SDA
WP
VCCH
DO0
DO1
DO2
DO3
8
9
VCCL
VSS
CLK
or BPDX
DO7
DO6
DO5
DO4
TIMEN
or RESX
DO6 TIMEN or RESX DO3
（1.93×2.07×0.6
max.）
Figure 1
*1.
Under development
Figure 2
List of Pin
Table 1 WLP-16A List of Pin
Pin No.
Table 2 16-Pin TSSOP List of Pin
Pin name
Description
Pin No.
Pin name
Description
CLK
Input for external clock
1
SCL
Input for serial clock
A1
*1
BPDX
Input for bus pull-down bar
2
VSS
GND
A2
SCL
Input for serial clock
CLK
Input for external clock
*1
3
BPDX
Input for bus pull-down bar
A3
WP
Input for Write protect
A4
VCCH
Power supply
4
DO7
Output port 7
B1
DO7
Output port 7
5
DO6
Output port 6
B2
VSS
GND
6
DO5
Output port 5
B3
SDA
Serial data I/O
7
DO4
Output port 4
B4
DO0
Output port 0
TIMEN
Input for timer enable
*2
8
RESX
Input for reset bar
C1
DO6
Output port 6
TIMEN
Input for timer enable
9
VCCL
Power supply for output port
C2
*2
RESX
Input for reset bar
10
DO3
Output port 3
C3
DO3
Output port 3
11
DO2
Output port 2
C4
DO1
Output port 1
12
DO1
Output port 1
D1
DO5
Output port 5
13
DO0
Output port 0
D2
DO4
Output port 4
14
VCCH
Power supply
D3
VCCL
Power supply for output port
15
WP
Input for Write protect
D4
DO2
Output port 2
16
SDA
Serial data I/O
Whether to set A1 in CLK or BPDX is selectable by option (Pin number is 3 for TSSOP).
Whether to set C2 in TIMEN or RESX is selectable by option (Pin number is 8 for TSSOP).
*1.
*2.
2
Seiko Instruments Inc.
PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E
2
PROM CIRCUIT)
Rev.1.3
_00
S-7760A
Block Diagram
V
CCH
VCCH
WP
E PROM
8 bit
×
6
Interface
Circuit
2
V
CCL
VCCL
Control Circuit for
Data Output
(Fixed Output)
Control Port Register
DO7
DO6
DO5
DO4
DO3
SDA
SCL
Decode Logic
for Data Register
Mode
TIMEN
or RESX
Timer Scale Setting
Register
Timer Setting
Register
Circuit for Prevention
Malfunction by Low
Voltage
VSS
Timer Enable
Register
Dividing
Circuit
Oscillation
Circuit
(Timer Action)
DO2
DO1
DO0
Decoder
CLK
or BPDX
Figure 3
Seiko Instruments Inc.
3
PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E
2
PROM CIRCUIT)
Rev.1.3
_00
S-7760A
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)/RESX (Input for reset bar) pin
Select TIMEN or RESX by option.
The TIMEN pin controls enable (“H”)/disable (“L”)/Start (“L”→”H”) in the timer action (inversion of digital output due to
elapsed period). Refer to the description of related register in “
Command”
and “
Condition to Start Timer”
regarding details of timer action.
The RESX pin has the negative logic, is a pin to reset. This pin initializes the circuit with “L” input, and performs its
regular action (the status of reset release) by inputting “H”. This pin goes in its reload action immediately after
releasing reset, thus by initializing, the value of related register is reloaded to the data that E
2
PROM has. If a user
selects the RESX pin, the TIMEN pin’s function will be invalid so that the internal signal of TIMEN is fixed in “L”.
5. CLK (Clock input)/BPDX (Input for bus pull-down bar) pin
As for primary clock for circuits, users can select either from the internal oscillation circuit or input it externally by
option. In case of using an external clock input, this pin works as the CLK pin to input clock by itself. In case of using
an internal oscillation circuit, users can set this pin as the BPDX pin by option. With “L” input from the BPDX pin, SDA
and SCL in I
2
C-bus interface are forcibly pulled-down. This pin performs its regular action by inputting “H”. Users also
can select the setting which does not have an internal oscillation circuit or bus pull-down for this pin.
6. DO0, DO1, DO2, DO3 (Digital output) pin
These are lower 4 channels in the digital output ports. Their default values are equal to the ones of a control port
register during output. These lower 4 channels are for timer action. Its output inverts after; the timer starts and delay
time has elapsed.
7. DO4, DO5, DO6, DO7 (Digital output) pin
These are the higher 4 channels in the digital output ports. Their default values are equal to the ones of a control port
register during output. These higher 4 channels have fixed output. The elapsed period does not make outputs
inverted.
8. VSS pin
Connect to GND.
9. 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”.
10. 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.1.3
_00
S-7760A
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.
TIMEN, CLK
Figure 4 TIMEN, CLK Pin
SCL
Figure 5 SCL Pin (When selecting CLK option)
SCL
Open drain output
Figure 6 SCL Pin (When selecting BPDX option)
SDA
Open drain output
Figure 7 SDA Pin
Seiko Instruments Inc.
5
