ZHCSPQ7A december 2022 – april 2023 MCT8315A
PRODUCTION DATA
- 1
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 Output Stage
- 7.3.2 Device Interface
- 7.3.3 Step-Down Mixed-Mode Buck Regulator
- 7.3.4 AVDD Linear Voltage Regulator
- 7.3.5 Charge Pump
- 7.3.6 Slew Rate Control
- 7.3.7 Cross Conduction (Dead Time)
- 7.3.8 Speed Control
- 7.3.9 Starting the Motor Under Different Initial Conditions
- 7.3.10 Motor Start Sequence (MSS)
- 7.3.11 Closed Loop Operation
- 7.3.12 Speed Loop
- 7.3.13 Input Power Regulation
- 7.3.14 Anti-Voltage Surge (AVS)
- 7.3.15 Output PWM Switching Frequency
- 7.3.16 Fast Start-up (< 50 ms)
- 7.3.17 Fast Deceleration
- 7.3.18 Active Demagnetization
- 7.3.19 Motor Stop Options
- 7.3.20 FG Configuration
- 7.3.21
Protections
- 7.3.21.1 VM Supply Undervoltage Lockout
- 7.3.21.2 AVDD Undervoltage Lockout (AVDD_UV)
- 7.3.21.3 BUCK Undervoltage Lockout (BUCK_UV)
- 7.3.21.4 VCP Charge Pump Undervoltage Lockout (CPUV)
- 7.3.21.5 Overvoltage Protection (OVP)
- 7.3.21.6 Overcurrent Protection (OCP)
- 7.3.21.7 Buck Overcurrent Protection
- 7.3.21.8
Cycle-by-Cycle (CBC) Current Limit (CBC_ILIMIT)
- 7.3.21.8.1 CBC_ILIMIT Automatic Recovery next PWM Cycle (CBC_ILIMIT_MODE = 000xb)
- 7.3.21.8.2 CBC_ILIMIT Automatic Recovery Threshold Based (CBC_ILIMIT_MODE = 001xb)
- 7.3.21.8.3 CBC_ILIMIT Automatic Recovery after 'n' PWM Cycles (CBC_ILIMIT_MODE = 010xb)
- 7.3.21.8.4 CBC_ILIMIT Report Only (CBC_ILIMIT_MODE = 0110b)
- 7.3.21.8.5 CBC_ILIMIT Disabled (CBC_ILIMIT_MODE = 0111b or 1xxxb)
- 7.3.21.9 Lock Detection Current Limit (LOCK_ILIMIT)
- 7.3.21.10 Thermal Warning (OTW)
- 7.3.21.11 Thermal Shutdown (TSD)
- 7.3.21.12 Motor Lock (MTR_LCK)
- 7.3.21.13 Motor Lock Detection
- 7.3.21.14 SW VM Undervoltage Protection
- 7.3.21.15 SW VM Overvoltage Protection
- 7.3.21.16 IPD Faults
- 7.4 Device Functional Modes
- 7.5 External Interface
- 7.6 EEPROM access and I2C interface
- 7.7 EEPROM (Non-Volatile) Register Map
- 7.8 RAM (Volatile) Register Map
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
7.6.2.2 I2C Write Transaction
MCT8315A write transaction over I2C involves the following sequence (see Figure 7-54).
- I2C start condition.
- Start is followed by the I2C target ID byte, made up of 7-bit target ID along with the R/W bit set to 0b. ACK in yellow box indicates that MCT8315A has processed the received target ID which has matched with it's I2C target ID and therefore will proceed with this transaction. If target ID received does not match with the I2C ID of MCT8315A, then the transaction is ignored. and no ACK is sent by MCT8315A.
- The target ID byte is followed by the 24-bit control word sent one byte at a time. Bit 23 in the control word is 0b as it is a write transaction. ACK in blue boxes correspond to acknowledgements sent by MCT8315A to the controller that the previous byte (of control word) has been received and next byte can be sent.
- The 24-bit control word is
then followed by the data bytes. The number of data bytes sent by the
controller depends on the DLEN field in the control word.
- While sending data bytes, the LSB byte is sent first. Refer to Section 7.6.2.4 for more details.
- 16-bit/32-bit write – The data sent is written to the address mentioned in control word.
- 64-bit Write – 64-bit is treated as two successive 32-bit writes. The address mentioned in control word is taken as Addr_1. Addr_2 is internally calculated by MCT8315A by incrementing Addr_1 by 0x2. A total of 8 data bytes are sent. The first 4 bytes (sent in LSB first) are written to Addr_1 and the next 4 bytes are written to Addr_2.
- ACK in blue boxes (after every data byte) correspond to the acknowledgement sent by MCT8315A to the controller that the previous data byte has been received and next data byte can be sent.
- If CRC is enabled, the packet ends with a CRC byte. CRC is calculated for the entire packet (Target ID + W bit, Control Word, Data Bytes). MCT8315A will send an ACK on receiving the CRC byte.
- I2C Stop condition from the controller to terminate the transaction.
Figure 7-54 I2C Write Transaction Sequence