- 您现在的位置：买卖IC网 > Sheet目录1201 > CDB4245 (Cirrus Logic Inc)BOARD EVAL FOR CS4245 CODEC
CS4245
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
17 18
19
20 21 22 23 24 25 26 27 28
SCL
CHIP ADDRESS (WRITE)
MAP BYTE
STOP
CHIP ADDRESS (READ)
DATA
DATA +1
DATA + n
SDA
1
0
0
1
1 AD1 AD0 0
7
6
5
4
3
2
1
0
1
0
0
1
1 AD1 AD0 1
7
0
7
0
7
0
START
ACK
ACK
START
ACK
ACK
NO
ACK
STOP
Figure 19. Control Port Timing, I2C Read
Since the read operation cannot set the MAP, an aborted write operation is used as a preamble. As shown
in Figure 19 , the write operation is aborted after the acknowledge for the MAP byte by sending a stop con-
dition. The following pseudocode illustrates an aborted write operation followed by a read operation.
Send start condition.
Send 10011xx0 (chip address & write operation).
Receive acknowledge bit.
Send MAP byte.
Receive acknowledge bit.
Send stop condition, aborting write.
Send start condition.
Send 10011xx1 (chip address & read operation).
Receive acknowledge bit.
Receive byte, contents of selected register.
Send acknowledge bit.
Send stop condition.
4.13
Interrupts and Overflow
The CS4245 has a comprehensive interrupt capability. The INT output pin is intended to drive the interrupt
input pin on the host microcontroller. The INT pin may function as either an active high CMOS driver or an
active low open-drain driver (see “Active High/Low (Bit 0) ” on page 50 ). When configured as active low
open-drain, the INT pin has no active pull-up transistor, allowing it to be used for wired-OR hook-ups with
multiple peripherals connected to the microcontroller interrupt input pin. In this configuration, an external
pull-up resistor must be placed on the INT pin for proper operation.
Many conditions can cause an interrupt, as listed in the interrupt status register descriptions (see “Interrupt
Status - Address 0Dh” on page 50 ). Each source may be masked off through mask register bits. In addition,
each source may be set to rising edge, falling edge, or level -sensitive. Combined with the opti on of level-
sensitive or edge-sensitive modes within the microcontroller, many different configurations are possible, de-
pending on the needs of the equipment designer.
The CS4245 also has a dedicated overflow output. The OVFL pin functions as active low open drain and
has no active pull-up transistor, thereby requiring an external pull-up resistor. The OVFL pin outputs an OR
of the ADCOverflow and ADCUnderflow conditions available in the Interrupt Status register; however, these
conditions do not need to be unmasked for proper operation of the OVFL pin.
DS656F3
39
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
CDB42L55
BOARD EVAL FOR CS42L55 CODEC
CDB44L11
EVALUATION BOARD FOR CS44L11
CDB48500-USB
KIT USB EVALUATION FOR CDB48500
CDB5378
EVALUATION BOARD FOR CS5378
CDB5460AU
EVALUATION BOARD FOR CS5460A
CDB5461AU
BOARD EVAL & SOFTWARE CS5461A
CDB5466U
BOARD EVAL & SOFTWARE CS5466 ADC
CDB5467U
BOARD EVAL FOR CS5467 ADC
相关代理商/技术参数
CDB42518
功能描述:音频 IC 开发工具 Eval Bd
RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V
CDB42528
功能描述:音频 IC 开发工具 Eval Bd
RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V
CDB4265
功能描述:音频 IC 开发工具 Eval Bd 192kHz CODEC w/PGA & Input Mux RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V
CDB4270
功能描述:音频 IC 开发工具 Eval Bd 105dB 192kHz CODEC
RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V
CDB4271
功能描述:音频 IC 开发工具 Eval Bd CS4271
RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V
CDB4272
功能描述:音频 IC 开发工具 Eval Bd CS4272
RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V
CDB4299
功能描述:音频 IC 开发工具 Eval Bd AC’97 CODEC w/SRC
RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V
CDB42L50
制造商:CIRRUS 制造商全称:Cirrus Logic 功能描述:Low Voltage, Stereo CODEC with headphone Amp