MB91401

Prelminary

2004.11.12

 

 

(10) I2C interface

Input timing specification

Parameter

Symbol

Pin

 

Value

Unit

Remarks

 

 

 

Min

 

Max

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SDA input setup time

ts2sdai

SDA

250

 

ns

*

 

 

 

 

 

 

 

 

SDA input hold time

th2sdai

SDA

0

 

ns

*

 

 

 

 

 

 

 

 

SCL cycle time

tcscli

SCL

10

 

s

*

 

 

 

 

 

 

 

 

SCL input “H” pulse time

twhscli

SCL

4

 

s

*

 

 

 

 

 

 

 

 

SCL input “L” pulse time

twlscli

SCL

4.7

 

s

*

 

 

 

 

 

 

 

 

SCL input setup time

ts2scli

SCL

4

 

s

*

 

 

 

 

 

 

 

 

SCL input hold time

th2scli

SCL

4.7

 

s

*

 

 

 

 

 

 

 

 

* : Initial Value : I2C bus standards.

 

 

 

 

 

 

 

 

 

STOP

START

 

 

 

 

 

 

 

 

RESTART

SDA (input)

D7

D6

D5

D4

D3

D2

D1

D0

ACK

 

ts2scli

th2scli

ts2sdai

 

th2sdai

 

 

 

 

ts2scli

th2scli

SCL (input)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tcscli

 

twhscli

twlscli

 

Output timing specification

Parameter

Symbol

Pin

Value

 

Unit

Remarks

 

 

 

Min

 

Max

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SCL output cycle time

tcsclo

SCL

(2 m) + 2

 

PCLK

*

 

 

 

 

 

 

 

 

SCL output “H” Pulse Time

twhsclo

SCL

m + 2

 

PCLK

*

 

 

 

 

 

 

 

 

SCL output “L” Pulse Time

twlsclo

SCL

m

 

PCLK

*

 

 

 

 

 

 

 

 

SCL output setup time

ts2sclo

SCL

m + 2

 

PCLK

*

 

 

 

 

 

 

 

 

SCL output hold time

th2sclo

SCL

m 2

 

PCLK

*

 

 

 

 

 

 

 

 

SDA output hold time

th2sdao

SDA

5

 

PCLK

*

 

 

 

 

 

 

 

 

*: For value m, refer to Section 7.5.2.3 “Clock Control Register (CCR) in the I2C Interface Specifications.” PCLK indicates I2C interface operating clock frequency.

STOP

START

 

 

 

 

 

 

 

 

RESTART

SDA (output)

D7

D6

D5

D4

D3

D2

D1

D0

ACK

 

ts2sclo

th2sclo

 

 

th2sdao

 

 

 

 

ts2sclo

th2sclo

SCL (output)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tcsclo

 

twhsclo

twlsclo

 

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Image 66
Fujitsu MB91401 manual 10 I2C interface, SCL Pclk, SDA Pclk

MB91401 specifications

The Fujitsu MB91401 microcontroller is a versatile device designed for automotive applications, embedded systems, and industrial control. It belongs to the MB91400 series, known for its robustness and efficiency. This series integrates advanced features and technologies that cater to a wide variety of real-time applications.

One of the standout features of the MB91401 is its 32-bit RISC architecture, which operates at clock speeds up to 40 MHz. This high-performance core enables rapid processing and data handling, making it suitable for demanding applications. The microcontroller is equipped with a generous amount of Flash memory, allowing developers to store essential firmware and applications directly on the chip, enhancing reliability and reducing design complexity.

Another key characteristic is its extensive memory configuration, which includes SRAM for data storage and EEPROM for non-volatile data retention. This combination provides flexibility for developers, enabling them to tailor the memory allocation based on specific application requirements.

The MB91401 is designed with a focus on peripheral integration. It features multiple I/O ports, timer units, and A/D converters, making it an ideal choice for applications that require precise timing and analog signal processing. The analog-to-digital converters offer high resolution and fast conversion speeds, which are critical in automotive and industrial control systems where accuracy is paramount.

Safety is a critical consideration in automotive applications, and the MB91401 addresses this with built-in diagnostic features and error detection capabilities. These features help ensure that the application remains functional and safe under various operating conditions.

In terms of connectivity, the microcontroller supports various communication protocols, including CAN, UART, and SPI, facilitating seamless integration with other systems and devices. This is particularly important in automotive applications where communication between different electronic control units (ECUs) is essential for overall system functionality.

The Fujitsu MB91401 is also designed for low power consumption, making it suitable for battery-operated devices and energy-sensitive applications. Its various power-saving modes allow developers to optimize the system's performance while extending operational life.

In summary, the Fujitsu MB91401 is a powerful and flexible microcontroller that combines high-performance processing with extensive peripheral support and safety features. Its robust architecture and energy-efficient design make it an excellent choice for a wide range of automotive and industrial applications, promoting both reliability and innovation in embedded system development.