參數(shù)資料
型號(hào)： SH1475IMLTRT
元件分類： 微控制器/微處理器
英文描述： SPECIALTY MICROPROCESSOR CIRCUIT, PQCC36
封裝： 6 X 6 MM, 0.50 MM PITCH, ROHS COMPLIANT, PLASTIC, MLPQ-36
文件頁(yè)數(shù)： 5/11頁(yè)
文件大?。?/td> 143K
代理商： SH1475IMLTRT
SH1475
PIN DEFINITIONS
Copyright 1999-2005 Semtech Corporation
SH1475 data sheet v1.08 (2005-04-21)
www.semtech.com
3
Mnemonic
Pin
Type
Name and Function
Thermal
–
Thermal pad: connect to ground
pad
Power
VDD
8
P
Power supply: 2.4 V – 5.5 V
VSS
13
P
Ground
VSS2
7
P
Connected to VSS
VREF
5
I
Analog voltage reference
Reset
nRST
6
I
Reset
Oscillators
XIN
11
I
Oscillator input
XOUT
12
O
Oscillator output
SPI
MOSI
30
O
Data output (master out slave in); tri-stated (floated) when
nChipSelect is high
MISO
31
I
Data input (master in slave out); ignored when
nChipSelect is high
SCLK
32
O
SPI clock output; tri-stated (floated) when nChipSelect is
high
nChipSelect
22
I
Chip Select: Active-low input from the host; if high,
SH1475 transmission is disabled; if low, SH1475
transmission is enabled
nWakeUp
29
O
nWakeUp: Active-low output from the SH1475; asserted
(low) for any transmission of the SH1475; clocking does
not start until nChipSelect is low
Switches
nSW1-nSW4
25-28
I/O
Switch 1–4 input
nSW5
23
I/O
Switch 5 input
Capacitive
Sensor
SWPWR
34
I/O
Switched power driver
RINT
35
I/O
Integration drive
AD
36
I/O
AD input
CP
1
I/O
Sample capacitor plus drive
CN
3
I/O
Sample capacitor minus drive
FDA
4
I/O
Fine D/A Adjustment
SENSE
2
I/O
Common sense signal
E1-E3
16-14
I/O
Sensor plate 1–3 drive
E4-E5
21-20
I/O
Sensor Plate 4–5 drive
E6
17
I/O
Sensor Plate 6 drive
Power
management
nTxReq
24
I
Transmit request: Active-low input from the host;
asserted (low) when host needs to send
WAKE
33
O
Periodic wake-up enable output
No connect
NC
9-10,
No connect
18-19
Note: A pin/lead mnemonic beginning with lower-case “n” denotes an active low signal.
Pin Types Legend: P=Power; I=Input; O=Output; I/O=Input or Output;
FUNCTIONAL DESCRIPTION
The SH1475 consists functionally
of several major sections (see the
block diagram on the previous
page). These include the
capacitive sensor interface, the
switch interface, the 16-bit timer,
the oscillator circuit, the full-duplex
SPI communication port, and the
power management. All sections
communicate with each other and
operate concurrently.
The SH1475 has a built-in
oscillator circuit intended to work
with an external 4.00 MHz ceramic
resonator with built-in load
capacitors, or an external 4.00 MHz
crystal.
The SH1475 samples five switches
and reports their state to the host
system. The five switches can be
mapped to MP3 player operation
buttons as follows (for example).
SW1 - Select
SW2 - Next
SW3 - Previous
SW4 - Play
SW5 - Menu
OSCILLATOR
SWITCHES
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