HDPM01 Datasheet, PDF (17/19 Pages) List of Unclassifed Manufacturers – Integrated pressure sensor

HDPM01
Sixth cycle: Master device calls HOPERF device address with a READ (8th SCL cycle SDA line high).
HOPERF device should acknowledge at the end. Seventh cycle: Master device cycles SCL line, first
addressed memory data appears on SDA line. If in step 7, “[00000000]” was sent, internal control
register data should appear (in the following steps, this case is assumed). Master device should send
‘Acknowledge’ at the end.
Eighth cycle: Master device continues cycle SCL line, next byte of internal memory should appear on
SDA line (MSB of X channel). The internal memory address pointer automatically moves to the next
byte. Master acknowledges.
Ninth cycle: LSB of X channel.
Tenth cycle: MSB of Y channel.
Eleventh cycle: LSB of Y channel.
Master ends communications by NOT sending ‘Acknowledge’ and also followed by a ‘STOP’ command.
EXAMPLE OF SET/RESET COIL
First cycle: START followed by a calling to slave address [0110xx0] to WRITE (8^th SCL, SDA keep low).
[xx] is determined by factory programming, total 4 different addresses are available.
Second cycle: After a acknowledge signal is received by master device (HOPERF device pulls SDA line
low during 9^th SCL pulse), master device sends “[00000000]” as the target address to be written into.
HOPERF device should acknowledge at the end (9th SCL pulse). Note: since HOPERF device has only
one internal register can be written into, user should always use “[00000000]” as the write address.
Third cycle: Master device writes to internal HOPERF device memory a code “[00000010]” as a wake-
up call to initiate a SET action, or a code “[00000100]” to initiate a RESET action. Note that in low
voltage mode, master need to issue SET command if the previous command is RESET, and issue a
RESET command if the previous command is SET. In the case of a cold start (device just powered on),
master should only issue SET command. The wait time from power on to SET command should be a
minimal 10ms. HOPERF device should send acknowledge. Note that SET and RESET bits should not
be set to “1” at the same time. In case of that happens, the device will only do a SET action. A STOP
command indicates the end of write operation.
A minimal 50us wait period should be given to HOPERF device to finish SET/RESET action before
taking a measurement. The SET or RESET bit will be automatically reset to “0” after SET/RESET is
done. And the device will go to sleep mode afterwards.
In low voltage operation mode, SET/RESET commands have to alternate. In other words, one can not
do a SET following a SET, same for RESET. The first command after initial power up should be SET. If
RESET command is attempted as the first command, it will be ignored Between SET and RESET, a
minimal 5ms need to be given for the voltage on capacitor to settle.
Note 1: at power-on, internal register and memory address pointer are reset to “0”.
Note 2: In low voltage operation mode, device requires an additional capacitor to be able to do
SET/RESET at lower supply voltage.
Tel: [phone] Fax: [phone] E-mail: [e-mail] http://www.hoperf.com
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