ATMEL AT91SAM7A2-AI Arm thumb - based microcontroller Datasheet

Features
• ARM7TDMI® ARM® Thumb® Processor Core
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– High Performance 32-bit RISC
– High-density 16-bit Instruction set (Thumb)
– Leader in MIPS/Watt
– Embedded ICE (In Circuit Emulation)
16 Kbytes Internal SRAM
Fully Programmable External Bus Interface (EBI)
– Maximum External Address Space of 6 Mbytes, Up to Four Chip Select Lines
8-level Priority, Vectored Interrupt Controller
– Three External Interrupts Including One Fast Interrupt Line
Ten Channel Peripheral Data Controller (PDC)
57 Programmable I/O Lines
Four 16-bit General Purpose Timers (GPT)
– Three Configurable Modes: Counter, PWM, Capture
– Four External Clock Inputs, Three Multi-purpose I/O Pins per Timer
Four 16-bit Simple Timers (ST)
Four Channel 16-bit Pulse Width Modulation (PWM)
Four CAN Controllers 2.0A and 2.0B Full CAN
– One with 32 Buffers, Three with 16 Buffers
Two USARTs
– Support for J1587 and LIN Protocols
One Master/Slave SPI Interface
– 8 to 16-bit Programmable Data Length
– Four External Serial Peripheral Chip Selects
Two 8-channel 10-bit Analog to Digital Converters (ADC)
Two 16-bit Capture Modules (CAPT)
Programmable Watch Timer (WT)
Programmable Watchdog (WD)
Power Management Controller (PMC)
– 32 kHz Oscillator, Main Oscillator and PLL
IEEE 1149.1 JTAG Boundary-scan on all Digital Pins
Fully Static Operation: 0 Hz to 30 MHz at VDDCORE=3.3V, 85°C
3.0V to 5.5V Operating Voltage Range
3.0V to 3.6V Core, Memory and Analog Voltage Range
-40° to +85°C Operating Temperature Range
Available in a 176-lead LQFP Package
AT91 ARM®
Thumb®- based
Microcontrollers
AT91SAM7A2
Summary
Description
The AT91SAM7A2 is based on the ARM7TDMI embedded processor. This processor
has a high-performance 32-bit RISC architecture with a high-density 16-bit instruction
set and very low power consumption.
In addition, a large number of internally banked registers result in very fast exception
handling, making the device ideal for real-time control applications.
The AT91SAM7A2 has a direct connection to off-chip memory, including Flash,
through the fully programmable External Bus Interface.
An 8-level priority vectored Interrupt Controller in conjunction with the Peripheral Data
Controller significantly improves the real time performance of the device. The device
is manufactured using high-density CMOS technology.
By combining the ARM7TDMI processor with an on-chip SRAM, and a wide range of
peripheral functions, including USART, SPI, CAN Controllers, Timer Counter and Analog-to-Digital Converters, on a monolithic chip, the AT91SAM7A2 is a powerful device
that provides a flexible, cost-effective solution to many compute-intensive embedded
control applications in the automotive and industrial world.
6021AS–ATARM–03/04
Note: This is a summary document. A complete document
is in preparation.
Block Diagram
Figure 1. Block Diagram
VDDIO
GND
I/O Power
Supply
Core Power
Supply
TEST
TMS
TCK
TDO
TDI
SCANEN
3V
FIQ
IRQ[1:0]
GND
VDVDORE
5V
Generic
Interrupt
Controller
SPCK/MPIO
MISO/MPIO
MOSI/MPIO
NPCS0/MPIO
NPCS1/MPIO
NPCS2/MPIO
NPCS3/MPIO
PIO
RXD0/MPIO
TXD0/MPIO
SCK0/MPIO
PIO
RXD1/MPIO
TXD1/MPIO
SCK1/MPIO
PIO
EBI
Embedded
ICE
SPI
10 Channel
PDC
Controller
2 PDC
Channels
Arbiter
ARM7TDMI
Core
AMBATM Bridge
SFM
USART0
2 PDC
Channels
USART1
LFCLK
Simple Timers
PIO TC0
T0TIOA1/MPIO
T0TIOB1/MPIO
T0TCLK1/MPIO
PIO TC1
T0TIOA2/MPIO
T0TIOB2/MPIO
T0TCLK2/MPIO
PIO TC2
NRESET
Reset
5V
Watch Dog
2 PDC
Channels
T0TIOA0/MPIO
T0TIOB0/MPIO
T0TCLK0/MPIO
3V
Internal SRAM
16 KB
ASB Controller
Timer T0
5V
ADD[19:1]
ADD0/NLB
ADD20/CS3
NOE/NRD
NWR0/NWE
NWR11/NUB
NCS[2:0]
D[15:0]
Advanced
Memory
Controller
JTAG
Select
Watch Timer
Clock
Controller
with PLL
CORECLK
RTCKI
RTCKO
MCKI
MCKO
ST0
CH0
CH1
PLLRC
3V
ST1
CH0
CH1
Capture 0
CAPT0
PDC Channel
Timer T1
T1TIOA0/MPIO
T1TIOB0/MPIO
T1TCLK0/MPIO
Capture 1
PIO
CAPT1
TC0
PDC Channel
PWM
UPIO
1 PDC
Channel
Analog
2
CAN3
5V
CH0
PWM0
CH1
PWM1
CH2
PWM2
CH3
PWM3
CANTX3
CANRX3
Full Speed Full Speed
32 Buffers 16 Buffers
CANTX2
Full Speed
16 Buffers
CANRX2
Full Speed
16 Buffers
CAN2
CANTX1
CAN1
CANRX1
CAN0
CANTX0
ANA1IN[7:0]
VREFP1
ADC0
ADC1
8-channel 8-channel
10-bit ADC 10-bit ADC
CANRX0
1 PDC
Channel
ANA0IN[7:0]
GND
VDDANA
Analog
Power
Suppy
VREFP0
PIO[31:0]
5V
AT91SAM7A2 - Summary
6021AS–ATARM–03/04
AT91SAM7A2 - Summary
Pin Configuration
Table 1. Pinout
Pin
Name
Pin
Name
Pin
Name
Pin
Name
1
VDDIO
45
GND
89
VDDIO
133
NOE/NRD
2
IRQ0
46
VDDIO
90
VDDANA
134
NCS0
3
IRQ1
47
UPIO5
91
VREFP0
135
ADD1
4
FIQ
48
UPIO6
92
ANA0IN0
136
D9
5
SCK0/MPIO
49
GND
93
ANA0IN1
137
D2
6
TXD0/MPIO
50
VDDIO
94
ANA0IN2
138
VDDCORE
7
RXD0/MPIO
51
UPIO7
95
ANA0IN3
139
D10
8
SCK1/MPIO
52
UPIO 8
96
ANA0IN4
140
D3
D11
9
TXD1/MPIO
53
UPIO 9
97
ANA0IN5
141
10
RXD1/MPIO
54
UPIO 10
98
ANA0IN6
142
D4
11
VDDCORE
55
UPIO 11
99
GND
143
D12
12
CANTX3
56
UPIO 12
100
VDDANA
144
D5
13
CANRX3
57
UPIO 13
101
ANA0IN7
145
D13
14
CAPT0
58
UPIO 14
102
VREFP1
146
D6
15
CAPT1
59
UPIO 15
103
ANA1IN0
147
D14
16
SPCK/MPIO
60
UPIO 16
104
ANA1IN1
148
D7
17
MISO/MPIO
61
UPIO 17
105
ANA1IN2
149
D15
18
MOSI/MPIO
62
UPIO 18
106
ANA1IN3
150
GND
19
NPCS0/MPIO
63
GND
107
ANA1IN4
151
ADD0/NLB
20
VDDIO
64
VDDIO
108
ANA1IN5
152
ADD17
ADD16
21
GND
65
UPIO19
109
ANA1IN6
153
22
NPCS1/MPIO
66
UPIO20
110
ANA1IN7
154
ADD15
23
NPCS2/MPIO
67
UPIO21
111
GND
55
ADD14
24
NPCS3/MPIO
68
UPIO22
112
VDDCORE
156
ADD13
25
T0TIOA0/MPIO
69
UPIO23
113
RTCKI
157
ADD12
26
T0TIOB0/MPIO
70
UPIO24
114
RTCKO
158
ADD11
27
T0TCLK0/MPIO
71
UPIO25
115
GND
159
ADD10
28
T0TIOA1/MPIO
72
UPIO26
116
VDDCORE
160
ADD9
ADD20/CS3
29
T0TIOB1/MPIO
73
UPIO27
117
SCANEN
161
30
T0TCLK1/MPIO
74
UPIO28
118
TEST
162
VDDCORE
31
T0TIOA2/MPIO
75
UPIO29
119
TMS
163
NWR0/NWE
32
T0TIOB2/MPIO
76
UPIO30/NWAIT
120
TDO
164
NCS2
33
VDDIO
77
UPIO31/CORECLK
121
TDI
165
NCS1
34
GND
78
CANTX0
122
TCK
166
ADD19
35
T0TCLK2/MPIO
79
CANRX0
123
GND
167
ADD18
36
T1TIOA0/MPIO
80
CANTX1
124
PLLRC
168
ADD8
37
T1TIOB0/MPIO
81
CANRX1
125
VDDCORE
169
ADD7
38
T1TCLK0/MPIO
82
CANTX2
126
MCKI
170
ADD6
39
NRESET
83
CANRX2
127
MCKO
171
ADD2
40
UPIO0
84
PWM0
128
GND
172
ADD3
41
UPIO1
85
PWM1
129
NWR1/NUB
173
ADD4
42
UPIO2
86
PWM2
130
D8
174
ADD5
43
UPIO3
87
PWM3
131
D1
175
GND
44
UPIO4
88
GND
132
D0
176
GND
3
6021AS–ATARM–03/04
144
143
142
141
140
139
138
137
136
135
134
133
168
167
166
165
164
163
162
161
160
159
158
157
156
155
154
153
152
151
150
149
148
147
146
145
176
175
174
173
172
171
170
169
Figure 2. Pin Configuration
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
132
131
130
129
128
127
126
125
124
123
122
121
120
119
118
117
116
115
114
113
112
111
110
109
108
107
106
105
104
103
102
101
100
99
98
97
96
95
94
93
92
91
90
89
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
37
38
39
40
41
42
43
44
4
AT91SAM7A2 - Summary
6021AS–ATARM–03/04
AT91SAM7A2 - Summary
Signal Description
Table 2. Signal Description
Module
Function
ADD[19:1]
External address bus
O
(Z)(1)
ADD0/NLB
External address line line/
Lower byte enable
O
L (Z)
ADD20/CS3
External address line/ Chip select
O
H (Z)
D[15:0]
External data bus
I/O
(Z)
NOE
Output enable
O
L (Z)
NWR0/NWE
Write enable
O
L (Z)
NCS[2:0]
Chip select lines
O
L (Z)
NWR1/NUB
Upper byte enable
O
L (Z)
NWAIT
External Wait
I
L
CORECLK
Core CLock
O
IRQ[1:0]
External interrupt lines
I
FIQ
Fast interrupt line
I
NRESET
Hardware reset input
I
MCKI
Master clock input
I
Master clock output
O
PLLRC
PLL RC network input
I
32.768 kHz
clock
RTCKI
32.768 KHz clock input
I
RTCKO
32.768 KHz clock output
O
PIO
UPIO[31:0]
General purpose I/O
I/O
(Z)
SCK0/MPIO
USART0 clock line
I/O
(Z)
Multiplexed with general purpose I/O
RXD0/MPIO
USART0 receive line
I/O
(Z)
Multiplexed with general purpose I/O
TXD0/MPIO
USART0 transmit line
I/O
(Z)
Multiplexed with general purpose I/O
SCK1/MPIO
USART1 clock line
I/O
(Z)
Multiplexed with general purpose I/O
RXD1/MPIO
USART1 receive line
I/O
(Z)
Multiplexed with general purpose I/O
TXD1/MPIO
USART1 transmit line
I/O
(Z)
Multiplexed with general purpose I/O
Capture0
CAPT0
Capture input
I
Capture1
CAPT1
Capture input
I
PWM
PWM[3:0]
Pulse Width Modulation output
O
(L)
T0TIOA[2:0]/MPIO Capture/waveform I/O
I/O
(Z)
Multiplexed with a general purpose I/O
T0TIOB[2:0]/MPIO Trigger/waveform I/O
I/O
(Z)
Multiplexed with a general purpose I/O
T0TIOCLK[2:0]/MP External clock/trigger/input
IO
I/O
(Z)
EBI
Type
Active
Level Comments
Name
The EBI is tri-stated when NRESET is at a
logical low level.
Internal pull-downs on data bus bits
Disable at reset, multiplexed with UPIO30
Disable at reset, multiplexed with UPIO31
GIC
Power-on
Reset
L
Schmitt input with internal filter
Connected to external crystal (4 to 6 Mhz)
Master Clock MCKO
USART0
USART1
Timer T0
Connected to external 32.768 Khz crystal
Multiplexed with a general purpose I/O
5
6021AS–ATARM–03/04
Table 2. Signal Description (Continued)
Module
Timer T1
Type
Active
Level Comments
Name
Function
T1TIOA/MPIO
Capture/waveform I/O
I/O
(Z)
Multiplexed with a general purpose I/O
T1TIOB/MPIO
Trigger/waveform I/O
I/O
(Z)
Multiplexed with a general purpose I/O
T0TIOCLK/MPIO
External clock/trigger/input
I/O
(Z)
Multiplexed with a general purpose I/O
ANA0IN[7:0]
Analog input
I
VREFP0
Positive voltage reference
I
ANA1IN[7:0]
Analog input
I
VREFP1
Positive voltage reference
I
SPCK/MPIO
SPI clock line
I/O
(Z)
Multiplexed with a general purpose I/O
MISO/MPIO
SPI master in slave out
I/O
(Z)
Multiplexed with a general purpose I/O
MOSI/MPIO
SPI master out slave in
I/O
(Z)
Multiplexed with a general purpose I/O
NPCS[3:1]/MPIO
SPI chip select
I/O
(Z)
Multiplexed with a general purpose I/O
I/O
(Z)
Multiplexed with a general purpose I/O
ADC0
ADC1
SPI
NPCS0/NSS/MPIO SPI chip select (slave input)
CANRX0
CAN0 receive line
I
L
CANTX0
CAN0 transmit line
O
L (H)
CANRX1
CAN1 receive line
I
L
CANTX1
CAN1 transmit line
O
L (H)
CANRX2
CAN2 receive line
I
L
CANTX2
CAN2 transmit line
O
L (H)
CANRX3
CAN3 receive line
I
L
CANTX3
CAN3 transmit line
O
L (H)
SCANEN
Scan enable
I
H
TDI
Test Data In
I
TDO
Test Data Out
O
TMS
Test Mode Select
I
Schmitt trigger, internal pull-up
TCK
Test Clock
I
Schmitt trigger, internal pull-up
TEST
Factory Test
I
VDDCORE
Core Power Supply
-
3.3V
VDDANA
Analog Power Supply
-
3.3V
VDDIO
I/O Lines Power Supply
-
3.3V to 5V
GND
Ground
-
CAN0
CAN1
CAN2
CAN3
Internal pull-down (connected GND or leave
unconnected)
Schmitt trigger, internal pull-up
JTAG
Power
Supplies
Note:
6
H
Internal pull-down (connected GND or leave
unconnected)
1. Values in brackets are the values at reset (H = High, L = Low, Z = High impedance state).
AT91SAM7A2 - Summary
6021AS–ATARM–03/04
AT91SAM7A2 - Summary
Architectural
Overview
The AT91SAM7A2 architecture consists of two main buses, the Advanced System Bus (ASB)
and the Advanced Peripheral Bus (APB). The ASB is designed for maximum performance. It
interfaces the processor with the on-chip 32-bit memories and the external memories and
devices by means of the External Bus Interface (EBI). The APB is designed for access to onchip peripherals and is optimized for low power consumption. The AMBA™Bridge provides an
interface between the ASB and the APB.
The AT91SAM7A2 peripherals are designed to be programmed with a minimum number of
instructions. Each peripheral has a 16 Kbyte address space allocated in the upper 1 Mbytes of
the 4 Gbyte address space. Except for the interrupt controller, the peripheral base address is
the lowest address of its memory space. The peripheral register set is composed of control,
mode, data, status and interrupt registers. To maximize the efficiency of bit manipulation, frequently written registers are mapped into three memory locations. The first address is used to
set the individual register bits, the second resets the bits and the third address reads the value
stored in the register. A bit can be set or reset by writing a one to the corresponding position at
the appropriate address. Writing a zero has no effect. Individual bits can thus be modified without having to use costly read-modify-write and complex bit manipulation instructions.
The ARM7TDMI processor operates in little-endian mode in the AT91SAM7A2 microcontroller. The processor's internal architecture and the ARM and Thumb instruction sets are
described in the ARM7TDMI Datasheet.
AMC: Advanced
Memory Controller
The AT91SAM7A2 embeds 16 Kbytes of internal SRAM. The internal memory is directly connected to the 32-bit data bus and is single-cycle accessible. This provides maximum
performance of 27 MIPS @ 30 MHz by using the ARM® instruction set of the processor, minimizing system power consumption and improving on the performance of separate memory
solutions.
EBI: External Bus
Interface
The EBI generates the signals which control the accesses to the external memories or peripheral devices. The EBI is fully programmable and can address up to 6 Mbytes. It has four chip
selects and a 21-bit address bus, the upper bit of which is multiplexed with a chip select. Separate read and write control signals allow for direct memory and peripheral interfacing. The
EBI supports different access protocols allowing single clock cycle memory accesses. The
main features are:
GIC: Generic
Interrupt
Controller
•
External Memory Mapping
•
Up to Four Chip Select Lines
•
Byte Write or Byte Select Lines
•
8-bit or 16-bit Data Bus
•
External Wait
•
Remap of Boot Memory
•
Two Different Read Protocols
•
Programmable Wait State Generation
The AT91SAM7A2 has an 8-level priority, individually maskable, vectored interrupt controller.
This feature substantially reduces the software and real time overhead in handling internal and
external interrupts. The interrupt controller is connected to the nFIQ (fast interrupt request)
and the nIRQ (standard interrupt request) inputs of the ARM7TDMI™ processor. The processor's nFIQ line can only be asserted by the external fast interrupt request input: FIQ. The nIRQ
line can be asserted by the interrupts generated by the on-chip peripherals and the external
interrupt request lines: IRQ0 to IRQ1. An 8-level priority encoder allows the customer to define
the priority between the different nIRQ interrupt sources. Internal sources are programmed to
7
6021AS–ATARM–03/04
be level sensitive or edge triggered. External sources can be programmed to be positive or
negative edge triggered or high or low level sensitive.
PIO: Parallel I/O
Controller
The AT91SAM7A2 has 57 configurable I/O lines. 32 pins (United PIO) on the AT91SAM7A2
are dedicated as general purpose I/O pins (UPIO0 to UPIO31). Other I/O lines are multiplexed
with an external signal of a peripheral to optimize the use of available package pins. The
United-PIO is controlled by a dedicated module. The others pins are configure in each module.
PDC: Peripheral
Data Controller
An on-chip, 10-channel Peripheral Data Controller (PDC) transfers data between the on-chip
peripherals and the on and off-chip memories without processor intervention. One PDC channel is connected to the receiving channel and one to the transmitting channel of each USART
and of the SPI. A single PDC channel is connected to each ADC and each Capture.
Most importantly, the PDC removes the processor interrupt handling over-head and significantly reduces the number of clock cycles required for a data transfer. It can transfer up to 64
Kbytes without reprogramming the starting address. As a result, the performance of the microcontroller is increased and the power consumption reduced.
USART: Universal
Synchronous
Asynchronous
Receiver
Transmitter
SPI: Serial
Peripheral
Interface
The AT91SAM7A2 provides two identical, full-duplex, universal synchronous asynchronous
receiver transmitter which are connected to the Peripheral Data Controller. The main features
are:
•
Programmable Baud Rate Generator
•
Parity, Framing and Overrun Error Detection
•
Line Break Generation and Detection
•
Automatic Echo, Local & Remote Loopback Modes
•
Multi-drop Mode: Address Detection and Generation
•
Interrupt Generation
•
Two Dedicated Peripheral Data Controller Channels
•
5-, 6-, 7-, 8- and 9-bit Character Length
•
Idle Flag for J1587 Protocol.
•
Smart Card Transmission Error Feature
•
Support LIN 1.2 Protocol with H/W Layer
The AT91SAM7A2 features an SPI that provides communication with external devices in master or slave mode. The SPI has four external chip selects that can be connected to up to 15
devices. The data length is programmable from 8- to 16-bit.
As for the USART, a two-channel PDC is used to move data directly between memory and the
SPI without CPU intervention for maximum real-time processing throughput.
CAN: Controller
Area Network
The AT91SAM7A2 provides four CANs (2.0A and 2.0B). These are based upon serial communications protocol which efficiently supports distributed real-time control with a very high level
of security (one with 32 mailboxes and the others with 16 mailboxes).
The main features are:
8
•
Prioritization of Messages
•
Multi-master
•
System Wide Data Consistency
•
Error Detection and Error Signaling
•
Automatic Retransmission Of Corrupted Messages
AT91SAM7A2 - Summary
6021AS–ATARM–03/04
AT91SAM7A2 - Summary
GPT: General
Purpose Timer
•
Automatic Reply After Receive a Remote Frame
•
Time Stamp on Each Transfer
•
Multicast Reception with Time Synchronization
•
Continuous Reception Mode
The AT91SAM7A2 features four General Purpose Timers. Each timer can be independently
programmed to perform a wide range of functions including frequency measurement, event
counting, interval measurement, pulse generation, delay timing and pulse width modulation.
Each General Purpose Timer has one external clock input, five internal clock inputs, and three
multi-purpose input/output signals which can be configured by the user. Each timer drives an
internal interrupt signal which can be programmed to generate processor interrupts via the
AIC (Advanced Interrupt Controller).
Three General Purpose Timers are grouped in the same block. This block has two global registers which act upon all three GPTs. The Block Control Register allows the three timers to be
started simultaneously with the same instruction. The Block Mode Register defines the external clock inputs for each timer, allowing them to be chained.
ST: Simple Timer
Simple Timers provide basic functions for timing calculation. Each channel of this timer has a
specific prescalar and a 16-bit counter. The prescalar defines the clock frequency of the channel counter. The 16-bit counter starts down-counting when a value different than zero is
loaded. An interrupt is generated when the counter is null.
CAPT: Capture
Module
The capture module is a frame analyzer. It stores the period of time between two edges of a
signal in a register. This period is described as a number of counter cycles. The capture allows
data transfers with the PDC.
PWM: Pulse Width
Modulation
The AT91SAM7A2 includes four PWM channels. Each channel can generate pulses. The frequency and the duty cycle of each channel can be configured.
WT: Watch Timer
The watch timer provides a seconds counter and an alarm function. The alarm register has a
resolution of 30.5 µs. This allows a 32-bit register to have sufficient range to cater for a 24 or
36 hour period.
WD: Watch Dog
The AT91SAM7A2 has an internal watchdog which can be used to prevent system lock-up if
the software becomes trapped in a deadlock.
SFM: Special
Function Module
The AT91SAM7A2 provides registers which implement the following special functions.
•
Chip Identification
•
RESET Status
9
6021AS–ATARM–03/04
ADC: Analog to
Digital Converter
The two identical 8-channel 10-bit Analog-to-Digital Converters (ADC) are based on a Successive Approximation Register (SAR) approach. Each ADC has 8 analog input pins, ANA0IN0 to
ANA0IN7 and ANA1IN0 to ANA1IN7, and provides an interrupt signal to the AIC. Both ADCs
share the analog power supply pins VDDA and GNDA, and the input reference voltage pin
VREFP. Each channel can be enabled or disabled independently, and has its own data register.
The ADC can be configured to automatically enter Sleep Mode after a conversion sequence,
and can be triggered by the software. The ADC allows a data transfer with the PDC.
PMC: Power
Management
Controller
The AT91SAM7A2 Power Management Controller allows optimization of power consumption.
The PMC enables/disables the clock inputs of the PDC and ARM core. Moreover, the main
oscillator, the PLL and the analog peripherals can be put in standby mode allowing minimum
power consumption to be obtained. The PMC provides the following operating modes:
•
Normal: the clock generator provides clock to chip.
•
Wait Mode: the ARM core clock is deactivated.
•
Slow Mode: the clock generator is deactivated, the system is clocked at 32.768 kHz.
Each peripheral clock can be independently stopped or started directly in the peripheral to further reduce power consumption in Normal, Wait and Slow Modes.
ICE Debug Mode
10
ARM Standard Embedded In Circuit Emulation is supported via the ICE port. It is connected to
a host computer via an external ICE Interface. In ICE Debug Mode the ARM core responds
with a non-JTAG chip ID which identifies the core to the ICE system. This is not JTAG IEEE
1149.1 compliant.
AT91SAM7A2 - Summary
6021AS–ATARM–03/04
AT91SAM7A2 - Summary
Ordering
Information
Table 3. Ordering Information
Ordering Code
Package
Temperature Operating Range
AT91SAM7A2-AI
TQFP 176
Industrial
(-40°C to +85°C)
11
6021AS–ATARM–03/04
Packaging Information
Package Drawing
Figure 3. 176-lead LQFP Package Drawing
aaa
bbb
PIN 1
S
ccc
ddd
R2
R1
0.25
c
c1
1
L1
12
AT91SAM7A2 - Summary
6021AS–ATARM–03/04
AT91SAM7A2 - Summary
Table 4. Package Dimensions (mm)
Symbol
Min
Nom
Max
c
0.09
0.20
c1
0.09
0.16
L
0.45
0.6
L1
0.75
1.00 REF
R2
0.08
R1
0.08
S
0.2
q
0°
θ1
0°
θ2
θ3
0.2
3.5°
7°
11°
12°
13°
11°
12°
13°
A
1.6
A1
0.05
A2
1.35
0.15
1.4
1.45
Tolerances of Form and Position
aaa
0.2
bbb
0.2
Table 5. Lead Count Dimensions (mm)
b
b1
Pin
Count
D/E
BSC
D1/E1
BSC
Min
Nom
Max
Min
Nom
Max
e
BSC
ccc
ddd
176
26.0
24.0
0.17
0.20
0.27
0.17
0.20
0.23
0.50
0.10
0.08
Table 6. Device and 176-lead LQFP Package Maximum Weight
1900
mg
13
6021AS–ATARM–03/04
Soldering
Profile
Table 7 gives the recommended soldering profile from J-STD-20.
Table 7. Soldering Profile
Convection or
IR/Convection
VPR
Average Ramp-up Rate (183°C to Peak)
3°C/sec. max.
10°C/sec.
Preheat Temperature 125°C ±25°C
120 sec. max
Temperature Maintained Above 183°C
60 sec. to 150 sec.
Time within 5°C of Actual Peak Temperature
10 sec. to 20 sec.
60 sec.
Peak Temperature Range
220 +5/-0°C or
235 +5/-0°C
215 to 219°C or
235 +5/-0°C
Ramp-down Rate
6°C/sec.
10°C/sec.
Time 25°C to Peak Temperature
6 min. max
Small packages may be subject to higher temperatures if they are reflowed in boards with
larger components. In this case, small packages may have to withstand temperatures of up to
235°C, not 220°C (IR reflow).
Recommended package reflow conditions depend on package thickness and volume. See
Table 8 below.
Table 8. Recommended Package Reflow Conditions (1, 2, 3)
Parameter
Temperature
Convection
220 +5/-0°C
VPR
215 to 219°C
IR/Convection
220 +5/-0°C
Notes:
1. The packages are qualified by Atmel by using IR reflow conditions, not convection or VPR.
2. By default, the package level 1 is qualified at 220°C (unless 235°C is stipulated).
3. The body temperature is the most important parameter but other profile parameters such as
total exposure time to hot temperature or heating rate may also influence component
reliability.
A maximum of three reflow passes is allowed per component.
14
AT91SAM7A2 - Summary
6021AS–ATARM–03/04
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