PBM220 seriesDigital barometer Features □ Supply voltage: 1.7 to 5.5V(Vdd) 1.2 to 5.5V(Vddio) □ 300 to 1100 hPa pressure range □ 8cm altitude resolution (RMS) □ 2.2ms fastest conversion time □ Calibrated and temperature compensated Application Examples □ Outdoor PND □ Sport watch □ Diving watch □ Weather forecast device □ Smart watch □ Altimeter and barometer for portable device □ Bike computer Descriptions The PBM220 is a new generation of high resolution digital barometer. The PBM220 is a digital pressure sensor which consists of a MEMS piezoresistive pressure sensor and a signal conditioning ASIC. The ASIC include a 24bits sigma-delta ADC, OTP memory for calibration data, and serial interface circuits. The PBM220 could provide both I2C and SPI interface to communicate with microcontroller. Pressure calibrated and temperature compensated were key features of the PBM220. The data stored in OTP memory could be used to calibrate the PBM220. The calibration procedure should be implemented by an external microprocessor. The PBM220 is low power and supply voltage designed and suitable for portable devices or battery-supplied ones. The PBM220 is designed for water resistant applications. It could meet the criterion of 100m water resistant according to ISO 2281 standard. Ordering information Competitive sensor & power supply solutions worldwide

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1 Functional Block and Pin Descriptions Competitive sensor & power supply solutions worldwide

2 Electrical Characteristic Parameter 1. All the data were measured with 3V supply voltage at a temperature of 25±3°C, unless otherwise noted. 2. Maximum error of pressure reading over the pressure range after offset adjusted at one pressure point. 3. Maximum error of pressure reading over the pressure range. 4^ccordjngJo^2Jbitjnteger^omjoensationformu|a^^^^^^^^^^^^^^^^^^^^^^^^^^^^^_ Competitive sensor & power supply solutions worldwide

4 Application Information Owing to state of the art, the PBM220 build a new standard of digital barometer. A 24bits sigma-delta ADC and a MEMS pressure sensor are integrated in a LGA substrate. Pressure calibrated and temperature compensated were key features of the PBM220. The PBM220 is low power and supply voltage designed and suitable for portable devices or battery-supplied ones. The data stored in OTP memory could be used to calibrate the PBM220. The calibration procedure should be implemented by a external microprocessor. By I2C or SPI interface, you can get the calibration data stored...

5 Control registers Table 5.1 control registers Reg 0xF6-0xF8 Data_out: 24 bits ADC output data Reg 0xF4 OSR<1:0>: 00:1024X, 01:2048X, 10:4096X, 11:8192X Measurement_control<5:0>: 101110, indicate a temperature conversion. 110100, indicate a pressure conversion. Reg 0xE0 Softreset : Write only register. If set to 0xB6, will perform a power on reset sequence. Auto returned to 0 after the soft reset completed. Reg {0xF1, 0xD0, 0xBB:0xAA} Calibration Registers : Total 20bytes calibration registers used for sensor calibration. Reg 0x6B PartID: 8 bits Part ID, the default value is 0x42. Reg 0x00 SDO_active:...

Table 5.2 Summary of instructions Competitive sensor & power supply solutions worldwide

Figure 6.1 SPI timing diagram The falling edge of CSB, in conjunction with the rising edge of SCLK, determines the start of framing. Once the beginning of the frame has been determined, timing is straightforward. The first phase of the transfer is the instruction phase, which consists of 16 bits followed by data that can be of variable lengths in multiples of 8 bits. If the device is configured with CSB tied low, framing begins with the first rising edge of SCLK. The instruction phase is the first 16 bits transmitted. As shown in Figure 5.2, the instruction phase is divided into a number of bit...

Data follows the instruction phase. The amount of data sent is determined by the word length (Bit W0 and Bit W1). This can be one or more bytes of data. All data is composed of 8-bit words. Data can be sent in either MSB-first mode or LSB-first mode (by setting ‘LSB_first’ bit). On power up, MSB-first mode is the default. This can be changed by programming the configuration register. In MSB-first mode, the serial exchange starts with the highest-order bit and ends with the LSB. In LSB-first mode, the order is reversed. (Figure 6.3) CSB \/ SDIO DON'T CARE \ R/W W1 | W0 | A12 | A11 | A10...

Table 7.2 Electrical specification of the I2C interface pins The I2C interface protocol has special bus signal conditions. Start (S), stop (P) and binary data conditions are shown below. At start condition, SCL is high and SDA has a falling edge. Then the slave address is sent. After the 7 address bits, the direction control bit R/W selects the read or write operation. When a slave device recognizes that it is being addressed, it should acknowledge by pulling SDA low in the ninth SCL (ACK) cycle. At stop condition, SCL is also high, but SDA has a rising edge. Data must be held stable at SDA when...

*T\Lr::r\_Ai:: xxjcxn DATA ACK START ADDRESS R/W ACK condition DATA ACK STOP Competitive sensor & power supply solutions worldwide

8.3.2 Sensor orientation relative to the tape Competitive sensor & power supply solutions worldwide

9 Document history and modification Rev. 0.1 0.2 First edition (Preliminary)_ Added: Filled in the spec. of Maximum error over supply voltage, page 4 Modified: SPI waveform, Fig. 6.1, Fig. 6.2, Fig. 6.3, Fig. 6.4 Register table, description related to 0xF4, page 6 I2C address “1101111”^”1101101” page 9_ Modified: Figure. 4.1 Application circuit for I2C interface, page 5_ Added: 100m water resistant, ISO 2281, page 1, 5_ Added: 8ms pressure conversion time, page 1 Modified: Function block diagram: Control Logics^ Control Logic, page 3 Application circuit: Microcontrillor^ Microcontroller, page...

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