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参数资料
| 型号： | MXB7846EEE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/24页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR TOUCH RES 16QSOP |
| 其它有关文件： | Automotive Product Guide |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 类型： | 温度传感器 |
| 输入类型： | 模拟 |
| 输出类型： | 数字 |
| 接口： | 4 线 |
| 电流 - 电源： | 950µA |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 管件 |
| 产品目录页面： | 1424 (CN2011-ZH PDF) |
MXB7846
2.375V to 5.25V, 4-Wire Touch-Screen Controller
with Internal Reference and Temperature Sensor
14
______________________________________________________________________________________
the ambient temperature. First, the
PENIRQ diode for-
ward bias voltage is measured by the ADC with an
address of A2 = 0, A1 = 0, and A0 = 0 at a known tem-
perature. Subsequent diode measurements provide an
estimate of the ambient temperature through extrapola-
tion. This assumes a temperature coefficient of
-2.1mV/°C. The single conversion method results in a
resolution of 0.3°C/LSB and a typical accuracy of ±3°C.
The differential conversion method uses two measure-
ment points. The first measurement (Temp0) is per-
formed with a fixed bias current into the
PENIRQ diode.
The second measurement (Temp1) is performed with a
fixed multiple of the original bias current with an
address of A2 = 1, A1 = 1, and A0 = 1. The voltage dif-
ference between the first and second conversion is
proportional to the absolute temperature and is
expressed by the following formula:
where T0 (Temp0) and T1 (Temp1) are the conversion
results.
This differential conversion method can provide much
improved absolute temperature measurement; however,
the resolution is reduced to 1.6°C/LSB.
Battery Voltage Monitor
A dedicated analog input (BAT) allows the MXB7846 to
monitor the system battery voltage. Figure 8 shows the
battery voltage monitoring circuitry. The MXB7846 mon-
itors battery voltages from 0 to 6V. An internal resistor
network divides down VBAT by 4 so that a 6.0V battery
voltage results in 1.5V at the ADC input. To minimize
power consumption, the divider is only enabled during
the sampling of VBAT.
Internal Reference
Enable the internal 2.5V reference by setting PD1 in the
control byte to a logic 1 (see Tables 3 and 4). The
MXB7846 uses the internal reference for single-ended
measurement mode, battery monitoring, temperature
measurement, and for measurement on the auxiliary
input. To minimize power consumption, disable the inter-
nal reference by setting PD1 to a logic 0 when performing
ratiometric position measurements. The internal 2.5V ref-
erence typically requires 10ms to settle (with no external
load). For optimum performance, connect a 0.1F capac-
itor from REF to GND. This internal reference can be over-
driven with an external reference. For best performance,
the internal reference should be disabled when the exter-
nal reference is applied. The internal reference of the
MXB7846 must also be disabled to maintain compatibility
with the MXB7843. To disable the internal reference of the
MXB7846 after power-up, a control byte with PD1 = 0 is
required. (See
Typical Operating Characteristics for
power-up time of the reference from power down.)
External Reference
Although the internal reference may be overdriven with
an external reference, the internal reference should be
disabled (PD1 = 0) for best performance when using
an external reference. During conversion, an external
reference at REF must deliver up to 40A DC load cur-
rent. If the reference has a higher output impedance or
is noisy, bypass it close to the REF pin with a 0.1F and
a 4.7F capacitor. Temperature measurements are
always performed using the internal reference.
Digital Interface
Initialization After Power-Up and Starting a
Conversion
The digital interface consists of three inputs, DIN, DCLK,
CS, and one output, DOUT. A logic-high on CS disables
the MXB7846 digital interface and places DOUT in a
high-impedance state. Pulling
CS low enables the
MXB7846 digital interface.
TC
T
VREF
()
.
(
)
°=
×
×
260
1
0
4096
1000
273
DC/DC
CONVERTER
12-BIT ADC
BATTERY
0 TO 6.0V
0 TO 1.5V
2.5k
Ω
7.5k
Ω
+2.375V TO +5.25V
BAT
VDD
BATTERY
MEASUREMENT ON
Figure 8. Battery Measurement Functional Block Diagram
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MXB7846EEE+ | 功能描述:触摸屏转换器和控制器 2.375-5.25V 4-Wire Touch-Screen Ctlr RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
| MXB7846EEE+T | 功能描述:触摸屏转换器和控制器 2.375-5.25V 4-Wire Touch-Screen Ctlr RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
| MXB7846EEE-T | 功能描述:触摸屏转换器和控制器 RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
| MXB7846EUE | 功能描述:触摸屏转换器和控制器 RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
| MXB7846EUE+ | 功能描述:触摸屏转换器和控制器 2.375-5.25V 4-Wire Touch-Screen Ctlr RoHS:否 制造商:Microchip Technology 类型:Resistive Touch Controllers 输入类型:3 Key 数据速率:140 SPS 分辨率:10 bit 接口类型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 电源电压:2.5 V to 5.25 V 电源电流:17 mA 工作温度:- 40 C to + 85 C 封装 / 箱体:SSOP-20 |
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