OM13006,598 NXP Semiconductors, OM13006,598 Datasheet - Page 112

• Manufacturer Part Number: OM13006,598
• Description: BOARD EVAL EM773 METER EU PLUG
• Manufacturer: NXP Semiconductors
• Type: Other Power Managementr

Specifications of OM13006,598

• Design Resources: Plug Meter Schematics, Gerber Files USB Dongle Schematics, Gerber Files
• Main Purpose: Power Management, Energy/Power Meter
• Embedded: Yes, MCU, 32-Bit
• Utilized Ic / Part: EM773FHN33,551
• Interface Type: USB
• Maximum Operating Temperature: + 150 C
• Operating Supply Voltage: 1.8 V to 3.6 V
• Product: Power Management Development Tools
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Primary Attributes: -
• Secondary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: EM773, OL2381
• Other names: 568-6681

NXP Semiconductors
UM10415
User manual
10.10.2 Address Registers, I2ADDR0 to I2ADDR3
10.10.3 Address mask registers, I2MASK0 to I2MASK3
10.10.4 Comparator
10.10.5 Shift register, I2DAT
10.10.6 Arbitration and synchronization logic
These registers may be loaded with the 7-bit slave address (7 most significant bits) to
which the I
LSB (GC) is used to enable General Call address (0x00) recognition. When multiple slave
addresses are enabled, the actual address received may be read from the I2DAT register
at the state where the own slave address has been received.
The four mask registers each contain seven active bits (7:1). Any bit in these registers
which is set to ‘1’ will cause an automatic compare on the corresponding bit of the
received address when it is compared to the I2ADDRn register associated with that mask
register. In other words, bits in an I2ADDRn register which are masked are not taken into
account in determining an address match.
If the I2ADDRn bit 0 (GC enable bit) is as set and bits(7:1) are all zeroes, then the part will
respond to a received address = “0000000” regardless of the state of the associated mask
register.
When an address-match interrupt occurs, the processor will have to read the data register
(I2DAT) to determine what the received address was that actually caused the match.
The comparator compares the received 7-bit slave address with its own slave address (7
most significant bits in I2ADR). It also compares the first received 8-bit byte with the
General Call address (0x00). If an equality is found, the appropriate status bits are set and
an interrupt is requested.
This 8-bit register contains a byte of serial data to be transmitted or a byte which has just
been received. Data in I2DAT is always shifted from right to left; the first bit to be
transmitted is the MSB (bit 7) and, after a byte has been received, the first bit of received
data is located at the MSB of I2DAT. While data is being shifted out, data on the bus is
simultaneously being shifted in; I2DAT always contains the last byte present on the bus.
Thus, in the event of lost arbitration, the transition from master transmitter to slave
receiver is made with the correct data in I2DAT.
In the master transmitter mode, the arbitration logic checks that every transmitted logic 1
actually appears as a logic 1 on the I
1 and pulls the SDA line low, arbitration is lost, and the I
from master transmitter to slave receiver. The I
pulses (on SCL) until transmission of the current serial byte is complete.
Arbitration may also be lost in the master receiver mode. Loss of arbitration in this mode
can only occur while the I
Arbitration is lost when another device on the bus pulls this signal low. Since this can
occur only at the end of a serial byte, the I
Figure 21
shows the arbitration procedure.
2
C block will respond when programmed as a slave transmitter or receiver. The
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 10 September 2010
2
C block is returning a “not acknowledge: (logic 1) to the bus.
2
C-bus. If another device on the bus overrules a logic
2
C block generates no further clock pulses.
2
C block will continue to output clock
Chapter 10: EM773 I2C-bus interface
2
C block immediately changes
UM10415
© NXP B.V. 2010. All rights reserved.
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