QT1100A-ISG 데이터 시트보기 (PDF) - Quantum Research Group
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QT1100A-ISG Datasheet PDF : 42 Pages
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timeslot after the second 0xF8 has been received. The user
can then track the progress of the key calibration with the
0x8k command (Section 3.5.4).
If no 0xF8 is returned, the command was not properly
received; the host should recover by issuing a ‘Return Last
Command’ command (0xC7) at least twice to make sure the
QT1100A and host are communicating properly with each
other, and then the 0x1k command should be sent again.
The chosen key ‘k’ is recalibrated in its normal burst
timeslot; normal running of the part is not interrupted and all
other keys operate correctly throughout. This command is for
use only during normal operation to try to recover a single
key that is stuck or has not calibrated correctly.
It is possible to issue several 0x1k commands to several
keys sequentially, however the 0xF8 return value should be
received back from a prior 0x1k command before a new
0x1k command is issued.
3.5 Status Commands
Status commands are used to evoke a response from the
QT1100A, for example to return signal values or to get key
status. See summary Table 3-2 on page 24.
3.5.1 Signal for 1 Key - 0x2k
Returns the raw signal for key k, where k = {0..9}. Example:
The command 0x25 addresses key 5. The value is a 16-bit
number and no CRC is appended to the return, so the return
data should not be considered secure under FMEA rules.
The valid return number range is from 0..4095. The high byte
is returned first.
3.5.2 Reference for Key ‘k’ - 0x4k
Returns the reference level for key k, where k = {0..9}.
Example: The command 0x48 addresses key 8. The value is
a 16-bit number and no CRC is appended to the return, so
the return data should not be considered secure under
FMEA rules. The valid return number range is from 0..4095.
The high byte is returned first.
3.5.3 Detect Integrator for Key ‘k’ - 0x6k
Returns the detect ‘normal’ detect integrator (‘DI’) for key k,
where k = {0..9}. Example: The command 0x63 addresses
key 3. The value is contained in the lower 4 bits of an 8-bit
character, i.e. in the range from 0..15; no CRC is appended
to the response, so the return data should not be considered
secure under FMEA rules.
3.5.4 Status for Key ‘k’ - 0x8k
Returns the status bits for key k, where k = {0..9}. Example:
The command 0x87 addresses key 7. The return value is
contained in a single 8-bit character. A CRC is appended to
the return; this CRC includes the command 0x8k itself as the
first byte in the CRC calculation.
The return bits are as follows:
Bit #
7
6
5
4
3
2
Description
1 = This key is in detect
(volatile)
unused
unused
1 = This key is in process of
detection (but not yet reported
as having detected) (volatile)
1 = This key is undergoing
calibration (volatile)
1 = This key has a cal error
(non-volatile)
1
1 = This key is experiencing
extreme signal conditions
(non-volatile)
0
1 = This key is disabled due
to a Setup configuration or
due to an extreme condition
(non-volatile)
Bit_7: 1 = Active key. The key is indicating a confirmed
touch. This bit is set or cleared dynamically depending on
the state of the DI counter for each key. This bit is will
self-clear when touch is no longer detected.
Bit_4: 1 = Detection pending. The key is in the process of
trying to confirm a detection (the signal is below NTHR),
but has not yet reported as active. Normally this flag is
only used for test purposes. This bit will self-clear when
the key falls out of this state.
Bit_3: 1 = Calibration in progress. The key is in the
process of calibration. This bit will self-clear when the
calibration is complete.
Bit_2: 1 = Cal error. There was an error on this key the last
time it attempted a calibration. This means an overflow
(signal >4095) or underflow (see Section 4.13, page 29)
occurred during a cal cycle for that key. This bit is
determined only after a Cal of the key in question (either
via Cal 0x03 or 0x1k commands). After Reset, these bits
are cleared for all 10 keys and are set (or not) after the
subsequent Cal of the key(s) in question.
Bit_2 is non-volatile and can only be cleared by
recalibration or a device reset. Note that keys with faulty
calibration stop operating and the corresponding
acquisition bursts are disabled.
Bit_1: 1 = Extreme signal. The signal level currently on this
key is either too high or too low for normal operation, i .e.
if the real-time signal falls below the minimum signal level
defined by LBLL (see Section 4.13, page 29), or if {signal
>4095} counts.
Bit_1 is non-volatile, that is, the bit will remain '1' even if
the problem is removed, until the key is recalibrated or
the device is reset. A key with Bit 1= 1 is automatically
disabled and its acquisition burst is disabled.
This type of error may occur because the key either lacks
a working Rs/Cs circuit or there is a short or open circuit.
Bit_0: 1 = Key disabled. This can be due to an intentional
Setups disable (NTHR Setup in the Setup block is set to
0) or, there is a problem with the SNS pins (see Bit_1
above).
This bit is persistent (non-volatile) and will not clear
unless the key is re-enabled via a new Setups block load.
3.5.5 Report 1st Key - 0xC0
Reports the first or only key to be touched, plus indicates if
there are yet other keys that are also touched.
The return bits are as follows:
Bit #
7
6
5
4
3
2
1
0
Description
Logical-OR of all error types
Reserved: Can report 0 or 1
# keys in detection, high bit
# keys in detection, low bit
Key bit 3
Key bit 2
Key bit 1
Key bit 0
LQ
19
Copyright © 2003-2005 QRG Ltd
QT1100A-ISG R3.02/1105
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