MPR031 查看數據表（PDF） - Unspecified

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MPR031

Proximity Capacitive Touch Sensor Controller

Unspecified 

SDA

SCL

S

START

CONDITION

Figure 7. Bit Transfer

P

STOP

CONDITION

2.3.4 Acknowledge

The acknowledge bit is a clocked 9th bit (Figure 8) which the recipient uses to handshake receipt of each byte of data. Thus each

byte transferred effectively requires 9 bits. The master generates the 9th clock pulse, and the recipient pulls down SDA during

the acknowledge clock pulse, such that the SDA line is stable low during the high period of the clock pulse. When the master is

transmitting to the MPR03X, the MPR03X generates the acknowledge bit, since the MPR03X is the recipient. When the MPR03X

is transmitting to the master, the master generates the acknowledge bit, since the master is the recipient.

START

CONDITION

SCL

1

CLOCK PULSE FOR

ACKNOWLEDGEMENT

2

8

9

SDA

BY TRANSMITTER

SDA S

BY RECEIVER

Figure 8. Acknowledge

2.3.5 The Slave Address

The MPR03X has a 7-bit long slave address (Figure 9). The bit following the 7-bit slave address (bit eight) is the R/W bit, which

is low for a write command and high for a read command.

SDA

1

0

0

MSB

1

0

1

0

R/W ACK

SCL

Figure 9. Slave Address

The MPR03X monitors the bus continuously, waiting for a START condition followed by its slave address. When a MPR03X

recognizes its slave address, it acknowledges and is then ready for continued communication.

The MPR031 and MPR032 slave addresses are show in Table 2.

Table 2.

Part Number

MPR031

MPR032

I2C Address

0x4A

0x4B

Sensors

Freescale Semiconductor

Preliminary

MPR03X

5

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