SCP1000 PCB1 VTI Technologies, SCP1000 PCB1 Datasheet - Page 8

• Manufacturer Part Number: SCP1000 PCB1
• Description: SENSOR SPI 30-120KPA PCB
• Manufacturer: VTI Technologies
• Series: SCP1000r

Specifications of SCP1000 PCB1

• Pressure Type: Absolute
• Operating Pressure: 4.35 ~ 17.40 PSI, 30 ~ 120 kPa
• Output: Digital
• Voltage - Supply: 2.4 V ~ 3.3 V
• Termination Style: Surface Mount
• Operating Temperature: -20°C ~ 70°C
• Package / Case: PCB Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 551-1042

2.1.1
2.1.2
2.1.2.1
VTI Technologies Oy
www.vti.fi
Power down-pin (PD) during start-up (Phase 1)
SCP1000 initialization during start-up (Phase 2)
SCP1000 initialization status check (optional)
Figure 3. Routine for start-up status check (optional).
SCP1000 has an external power down (PD) pin. In case the system has power management
capabilities, it is recommended that during power up the PD pin is tied to DVDD – this way the
sensor is forced to remain in power down mode during the stabilization of the power supplies. After
approximately 1ms (or longer depending on the power supply stabilization time) the PD pin can be
switched to DVSS allowing the sensor to start the power up and the initialization procedure to
begin.
In case the system does not have power management capability the PD pin can be tied to DVSS.
A 60 ms delay after the start-up (Phase 1 in Figure 2) is recommended. After the delay initialization
will be finished and all configuration registers are loaded with their default values. During the 60 ms
start-up delay there should not be any interface activity attempts.
Start-up status check is optional and can be replaced with 90 ms delay, see Figure 2.
The start-up status check includes EEPROM checksum error result check. The routine is described
in Figure 3 and in sections 2.1.2.1 and 2.1.2.2 below.
The STATUS register 0x07 (see Figure 3) can be read to verify that start-up procedure is finished.
If the STARTUP bit (LSB) of the STATUS register (0X07) is ‘0’, the start-up procedure is finished
successfully. If the STARTUP bit of the STATUS register is ‘1’, the start-up procedure is still
running.
If the start-up procedure is still running, it is advised to re-check the STATUS register after a delay.
A recommend delay is 10ms. If the start-up procedure is not finished after the additional delay, the
re-check procedure can be started again (see Figure 3). In order to avoid infinite loop in case of
sensor malfunction it is advisable to limit the maximum number of cycles. Recommended value is 6
cycles when using 10 ms additional delay. If the start-up procedure is not finished successfully after
the maximum number of STATUS register re-check cycles has expired, the start-up procedure has
failed.
STATUS register
standby mode
SCP1000 is in
measurement
waiting for
YES
YES
DATARD8
register
command
LSB = 0
LSB = 1
0x07
READ
READ
N1)
N4)
NO
NO
checksum error
ERROR EXIT
ERROR EXIT
loop counter
Loop count
start-up fail
≥ MAX
EEPROM
Increment
YES
N2)
Doc.Nr. 8260800.08
Subject to changes
NO
Delay 10 ms
N3)
N1)
N2
N3
N4
)
)
)
See
me
The maximum number of retries (MAX loop count)
depends entirel
rec
The
dep
def
DA
inte
interface (SCP10
0x0
ans that start-up procedure is finished.
ommended value is 6.
ault value is 10 ms.
TARD8 register has address 0x1F when
ending on the system desig
rface (SCP1000-D01) and 0x7F when u
1, the EEPROM checksum is correct.
recommended loop delay time can be chang
the status register details in section 3.2. LSB = ‘0’
y on the system design. The
00-D11). If the content of DATARD8 is
n. The recommended
SCP1000 Series
sing TWI
using SPI
Rev.0.08
ed
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