ADUC7121BBCZ datasheet(2/102 Pages) AD

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ADuC7120/ADuC7121

Data Sheet

Rev. D | Page 2 of 102

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

Functional Block Diagram .............................................................. 1

Revision History ............................................................................... 3

General Description ......................................................................... 4

Specifications..................................................................................... 5

Timing Specifications ................................................................ 10

Absolute Maximum Ratings.......................................................... 15

Thermal Resistance .................................................................... 15

ESD Caution................................................................................ 15

Pin Configurations and Function Descriptions ......................... 16

Terminology .................................................................................... 24

ADC Specifications .................................................................... 24

DAC Specifications..................................................................... 24

Overview of the ARM7TDMI Core............................................. 25

Thumb (T) Mode........................................................................ 25

Long Multiply (M)...................................................................... 25

EmbeddedICE (I) ....................................................................... 25

Exceptions ................................................................................... 25

ARM Registers ............................................................................ 26

Interrupt Latency........................................................................ 26

Memory Organization ................................................................... 27

Memory Access........................................................................... 27

Flash/EE Memory....................................................................... 27

SRAM........................................................................................... 27

Memory Mapped Registers (MMR)......................................... 27

Complete MMR Listing............................................................. 28

ADC Circuit Overview .................................................................. 31

ADC Transfer Function............................................................. 31

Temperature Sensor ................................................................... 33

Converter Operation.................................................................. 36

Driving the Analog Inputs ........................................................ 37

Band Gap Reference................................................................... 38

Power Supply Monitor (PSM)................................................... 39

Nonvolatile Flash/EE Memory ..................................................... 40

Flash/EE Memory Overview..................................................... 40

Flash/EE Memory Security ....................................................... 41

Flash/EE Control Interface........................................................ 41

Execution Time from SRAM and Flash/EE............................ 44

Reset and Remap ........................................................................ 44

Other Analog Peripherals.............................................................. 46

DACs............................................................................................ 46

Low Dropout (LDO) Regulator................................................ 49

Current Output DACs (IDAC)................................................. 50

IDAC MMRs............................................................................... 51

Oscillator and PLL—Power Control........................................ 52

Digital Peripherals.......................................................................... 55

Pulse-Width Modulator (PWM) Overview............................ 55

PWM Convert Start Control .................................................... 57

General-Purpose Input/Output.................................................... 58

UART Serial Interface.................................................................... 62

Baud Rate Generation................................................................ 62

UART Register Definition......................................................... 62

I2C Peripherals ................................................................................ 66

Serial Clock Generation ............................................................ 66

I2C Bus Addresses....................................................................... 66

I2C Registers................................................................................ 67

I2C Common Registers.............................................................. 74

Serial Peripheral Interface ............................................................. 75

SPI Master In, Slave Out (MISO) Pin...................................... 75

SPI Master Out, Slave In (MOSI) Pin...................................... 75

Serial Clock Input/Output (SPICLK) Pin ............................... 75

SPI Chip Select Input Pin.......................................................... 75

Configuring External Pins for SPI Functionality................... 75

SPI Registers................................................................................ 75

Programmable Logic Array (PLA)............................................... 78

PLA MMRs Interface................................................................. 79

Interrupt System ............................................................................. 82

Normal Interrupt Request (IRQ) ............................................. 82

Fast Interrupt Request (FIQ) .................................................... 83

External Interrupts (IRQ0 to IRQ5) ........................................ 88

Timers .............................................................................................. 89

Hour: Minute: Second: 1/128 Format...................................... 89

Timer0—Lifetime Timer........................................................... 89

Timer1—General-Purpose Timer ........................................... 91

Timer2—Wake-Up Timer......................................................... 93

Timer3—Watchdog Timer........................................................ 94

Timer4—General-Purpose Timer ........................................... 97

Hardware Design Considerations ................................................ 99

Power Supplies............................................................................ 99

ADUC7121BBCZ Datasheet(PDF) 2 Page - Analog Devices

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