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參數(shù)資料
| 型號： | ADS7845E |
| 英文描述： | TOUCH SCREEN CONTROLLER |
| 中文描述： | 觸摸屏控制器 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 173K |
| 代理商： | ADS7845E |
10
ADS7845
16 Clocks per Conversion
The control bits for conversion n+1 can be overlapped with
conversion ‘n’ to allow for a conversion every 16 clock
cycles, as shown in Figure 6. This figure also shows possible
serial communication occurring with other serial peripherals
between each byte transfer between the processor and the
converter. This is possible provided that each conversion
completes within 1.6ms of starting. Otherwise, the signal
that has been captured on the input sample/hold may droop
enough to affect the conversion result. Note that the ADS7845
is fully powered while other serial communications are
taking place during a conversion.
Digital Timing
Figure 7 and Table VI provide detailed timing for the digital
interface of the ADS7845.
15 Clocks per Conversion
Figure 8 provides the fastest way to clock the ADS7845.
This method will not work with the serial interface of most
microcontrollers and digital signal processors as they are
generally not capable of providing 15 clock cycles per serial
transfer. However, this method could be used with Field
Programmable Gate Arrays (FPGAs) or Application Spe-
cific Integrated Circuits (ASICs). This effectively increases
the maximum conversion rate of the converter beyond the
values given in the Specification table, which assume 16
clock cycles per conversion.
SYMBOL
DESCRIPTION
MIN
TYP
MAX
UNITS
t
ACQ
Acquisition Time
1.5
μ
s
t
DS
DIN Valid Prior to DCLK Rising
100
ns
t
DH
DIN Hold After DCLK HIGH
10
ns
t
DO
DCLK Falling to DOUT Valid
200
ns
t
DV
CS Falling to DOUT Enabled
200
ns
t
TR
CS Rising to DOUT Disabled
200
ns
t
CSS
CS Falling to First DCLK Rising
100
ns
t
CSH
CS Rising to DCLK Ignored
0
ns
t
CH
DCLK HIGH
200
ns
t
CL
DCLK LOW
200
ns
t
BD
DCLK Falling to BUSY Rising
200
ns
t
BDV
CS Falling to BUSY Enabled
200
ns
t
BTR
CS Rising to BUSY Disabled
200
ns
TABLE VI. Timing Specifications (+V
CC
= +2.7V and
Above, T
A
= –40
°
C to +85
°
C, C
LOAD
= 50pF).
FIGURE 7. Detailed Timing Diagram.
FIGURE 8. Maximum Conversion Rate, 15 Clocks per Conversion.
PD0
t
BDV
t
DH
t
CH
t
CL
t
DS
t
CSS
t
DV
t
BD
t
BD
t
TR
t
BTR
t
D0
t
CSH
DCLK
CS
11
DOUT
BUSY
DIN
10
1
DCLK
CS
11
DOUT
BUSY
A2
S
DIN
A1 A0
MODEDIF
PD1 PD0
10
9
8
7
6
5
4
3
2
1
0
11
10
9
8
7
6
5
4
3
2
A1 A0
15
1
15
1
A2
S
A1 A0
MODEDIF
PD1 PD0
A2
S
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| ADS7846N | TOUCH-SCREEN CONTROLLER |
| ADS7846 | CMOS 8-Stage Presettable 8-Bit Binary Synchronous Down Counter 16-TSSOP -55 to 125 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS7845E | 制造商:Texas Instruments 功能描述:5 WIRE TOUCH SCREEN CONTR 16SSOP 制造商:Texas Instruments 功能描述:5 WIRE TOUCH SCREEN CONTR, 16SSOP 制造商:Texas Instruments 功能描述:5 WIRE TOUCH SCREEN CONTR, 16SSOP; Interface Type:5 Wire, Serial, SPI; Resolution (Bits):12bit; Supply Voltage Min:2.7V; Supply Voltage Max:5.5V; Digital IC Case Style:MSOP; No. of Pins:16; Operating Temperature Min:-40C; Operating ;RoHS Compliant: Yes |
| ADS7845E | 制造商:Texas Instruments 功能描述:IC's |
| ADS7845E/2K5 | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 5-wire Touch Screen Controller RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
| ADS7845E/2K5G4 | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 5-wire Touch Screen Controller RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
| ADS7845EG4 | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 5-wire Touch Screen Controller RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
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