qt60161b Quantum Research Group, qt60161b Datasheet - Page 14

• Manufacturer Part Number: qt60161b
• Description: 16 Key Qmatrix Keypanel Sensor Ic
• Manufacturer: Quantum Research Group

4.5 UART Interface
Refer to Figures 4-1 and 4-5.
UART communications requires only 2 wires, TX and RX to
communicate with a host device. All communications must be
lQ
{from sensor}
{from sensor}
{from sensor}
{from host}
{from host}
{from host}
{from host}
MOSI
SCK
SS
RX
TX
DRDY
MOSI
MISO
SCK
SS
from Host to sensor
7 6 5 4 3 2 1 0
Command Byte 1
S
from host to sensor
Host Command Byte 1
Command Byte 1
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
0
SS, SCK, MOSI originate from Host
Invalid Data
1
2
Table 4-1 Typical Tdr1 Response Delays (100µs sample ramp)
3
Calibrate command (all keys)
T cm
Setup - Put (affect 16 keys)
4
Setup - Put (affect 8 keys)
Setup - Put (affect 1 key)
Lock reference Level (L)
T cm
5
T cm
Get keys pushed (K)
All other commands
6
Get key errors (E)
Function Type
7
Figure 4-4 SPI Master/Slave Mode Timing
Figure 4-3 SPI Slave-Only Mode Timing
7 6 5 4 3 2 1 0
from host to sensor
Optional Byte 2
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
S
Optional Byte 2
from host to sensor
Invalid Data
0
©Quantum Research Group Ltd.
Optional Byte 2
Figure 4-5 UART Timing
1
2
T dr1
3
4
T dr1
5
Floating
6
7
14
initiated by the host. The baud rate is determined by Setup
^Q (page 25); the maximum baud rate with a 12MHz oscillator
is 57.6K. UART communications uses the following settings:
Response Data or Echo
Response Byte or Echo
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
from sensor to host
Null Dummy Data
T dr1
Response Byte or Echo
S
from sensor to host
0
SS, SCK, MOSI originate from sensor
T dr3
T dr2
500µs
500µs
450µs
350µs
350µs
10ms
20ms
65ms
65ms
1
2
3
www.qprox.com QT60161B / R1.03
4
T dr3
5
Burst Spacing
6
7
500µs
450µs
350µs
350µs
10ms
20ms
65ms
65ms
1ms
{N = command dependent}
{N = command dependent}
Nth Byte from sensor
7 6 5 4 3 2 1 0
{N = command dependent}
Nth Response Data
7 6 5 4 3 2 1 0
Null Dummy Data
S
T dr3
Nth Byte from sensor
0
1
500µs
450µs
350µs
350µs
10ms
20ms
65ms
65ms
2ms
2
3
4
5
6
7