QT60248-ASG Atmel, QT60248-ASG Datasheet - Page 22

• Manufacturer Part Number: QT60248-ASG
• Description: IC SENSOR QMATRIX 24CHAN 32TQFP
• Manufacturer: Atmel
• Series: QMatrix™, QProx™r
• Type: Capacitiver

Specifications of QT60248-ASG

• Number Of Inputs/keys: 24 Key
• Resolution (bits): 9, 11 b
• Data Interface: Serial, SPI™
• Voltage - Supply: 3 V ~ 5 V
• Current - Supply: 25mA
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 32-TQFP, 32-VQFP
• Output Type: Logic
• Interface: SPI
• Input Type: Logic
• Operating Supply Voltage: 3 V to 5 V
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• For Use With: 427-1087 - BOARD EVAL QT60248-AS QMATRIX
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 427-1108

Table 5.1 Setups Block
Setups data is sent from the host to the QT in a block of hex data. The block can only be loaded in Setups mode following two se quential 0x01 commands (page 12). All
devices this datasheet pertain to have the same block length. Refer also to Table 5.3, page 23 for further details, and all of Section 5.
CRC Note: A CRC calculator for Windows is available free of charge from Quantum Research on request.
Table 5.2 Key Mapping
Some commands return bitfields related to keys. For example, command 0x07 (report all keys) returns 3 bytes containing flag bits, one per key, to indicate which keys are reporting
touches. The following table shows the byte and bit order of the keys. The table contains the key number reported in each bit.
The key number is related to the X and Y scan lines which address each particular key. Each byte in the return stream represents one set of keys along a Y line, ie up to 8 keys.
Thus, key 0 is at location X0,Y0 and key 19 is at location X3,Y2. .
lQ
Item
#
1
2
3
4
5
6
7
8
Byte
100
24
48
72
96
97
98
0
Parameter
Neg thresh
Neg Drift Comp
Normal DI Limit
Fast DI Limit
Neg recal delay
Burst Length
AKS
Scope Sync
Mains Sync
Burst spacing
Lower signal Limit
Host CRC byte
Block length
Symbol
NDRIFT
MSYNC
SSYNC
HCRC
NTHR
NDIL
FDIL
NRD
AKS
LSL
BS
BL
(Y line)
Byte
Bytes
101
24
24
24
24
1
1
2
1
0
1
2
NDRIFT = 0..15
Valid range
BL = 0, 1, 2, 3
MSYNC = 0, 1
NTHR = 0..15
SSYNC = 0, 1
NDIL = 0..15
FDIL = 0..15
AKS = 0, 1
BS = 0..11
0..2048
0..254
0..255
15
23
7
7
14
22
6
6
Bits
16
4
4
4
4
8
2
1
1
1
4
8
Scope
Key
24
24
24
13
21
1
1
1
1
1
1
1
1
5
5
Note: Byte 0 is returned first.
-
22
Default
Value
100
10
20
12
20
6
2
5
2
0
0
0
1
Bit
-
4
4
(X line)
Description
Lower nibble = Neg Threshold - take operand and add 4 to get value
Upper nibble = Neg Drift comp - Via LUT
Lower nibble = Normal DI Limit, values same as operand (0 = disables key)
Upper nibble = Fast DI Limit, values same as operand (0 does not work)
Range is in 0.5 sec increments; 0 = infinite; default = 10s (operand = 20)
Range is { infinite, 0.5...127s }; 255 is illegal to use
Bits 5, 4: = BL, via LUT, default = 48 (setting =2)
Bit 6 = AKS, 1 - enabled
Bit 7 = Scope sync, 1 = enabled
Bit 6 = Mains sync, negative edge, 1 = enabled; default = 0 (off)
Lower nibble = burst spacing
Lower limit of acceptable signal; below this value, device declares an error.
The low order byte should be sent first.
11
19
3
3
10
18
2
2
17
1
1
9
16
0
0
8
QT60248-AS R4.02/0405
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