LIS1R02 STMICROELECTRONICS | Alldatasheet
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LIS1R02 (L6671) April 2002 This is preliminary information on a new product now in development. Details are subject to change without notice. ■ HIGH SENSITIVITY 2.5 rad/sec2 ■ 8 BIT A/D CONVERTER ■ 800 Hz BANDWIDTH ■ 200 rad/sec2 FULL SCALE VALUE ■ DIGITAL DOWNSAMPLING ■ DIGITAL FILTERING ■ 3.3V 3WIRES SERIAL INTERFACE (5V TOLLERANCE) ■ EMBEDDED PLL
DESCRIPTION
The LIS1R02 is a complete rotational accelerometer system based on a ΣΔ architecture, followed by a digital downsampling block and a digital filter, featur- ing high sensitivity, 800 Hz signal bandwidth and a complete serial port interface for a direct connection to microprocessor environment. An embedded PLL allows internal clock generation from an external syn- chronization signal. SO24 ORDERING NUMBER: LIS1R02 PRODUCT PREVIEW ANGULAR ACCELEROMETER BLOCK DIAGRAM A/D CONVERTER SENSOR DIGITAL FILTER SER. IFC SPE D02IN1363 SPD SPC PLL Clk-IN
LIS1R02 (L6671) PIN FUNCTION (*) Must be shorted to Pin 10 (**) Must be shorted to Pin 7 PIN CONNECTIONS (Top view) N°. Pin Name Function Typ. Condition 1 to 6 GND Ground 7 Vdd_Analog Analog Voltage Supply 5V T yp. (*)
8 Ref_Cap Reference Voltage Bypass
9 HV_Eprom EPROM Programming Voltage (test mode only) Tied to GND
10 Vdd_Digital Digital Voltage Supply 5V T yp. (**)
11 SPC Serial Port Clock Signal
12 SPD Serial Port Data Signal
13 SPE Serial Port Enable Signal
14 CLK_In External Clock / PLL Reference Input
15 Gnd_Digital Digital Ground Pin
16 Funct_T est Self Test
17 T est_ST T est Pin Tied to GND
18 Gnd_Analog Analog Ground Pin
V DD _ANALOG GND REF_CAP HV_EPROM FUNCT_TEST TEST_ST GND_ANALOG GND GND GND GND GND GND1 V DD _DIGITAL GND_DIGITAL D02IN1362 SPC CLK_IN11 14 1312SPD SPE
LIS1R02 (L6671) ABSOLUTE MAXIMUM RATINGS ELECTRICAL CHARACTERISTCS Symbol Parameter Value Unit VddAnalog Max Maximum analog supply voltage 7 V VddDigital MaxMaximum digital supply voltage 7 V Vin Voltage Range on SPC, SPE, SPD, CLK_In, Funct_T est -0.3 to Vdd Dig + 0.3 Symbol Parameter Test Condition Min. Typ. Max. Unit DC VddAnalog Max Analog Supply Voltage 4.5 5.0 5.5 V VddDigital MaxDigital Supply Voltage 4.5 5.0 5.5 V IddAnalog Analog Circuitry Supply Current 15 mA IddDigital Digital Circuitry Supply Current 11 mA Vref Voltage on Ref_Cap pin 2.225 V Voh (on SPD and Funct_T est) @ Ioh = 3mA >2 V Vol <1 V Vih 2.6 V Vil 0.8 V ADC ADC SNR (30-800Hz, 4.48MHz Ext.Clk) 35 38 dB ADC SNR (30-10000Hz, 4.48MHz Ext.Clk) 15 20 dB Phase error 30-800Hz (relative to a ref. Accelerometer) -30 deg ADC Full Scale 200 rad/ sec2 ADC Bandwidth 1-800 Hz ADC Dynamic Range 38 dB ADC Differential Linearity <3% ADC Integral Linearity <5% Full Scale Mclk Clock Frequency on CLK_In pin 6 MHz
Figure 1. Application Diagram
LIS1R02 (L6671) SERIAL PORT, REGISTERS, EPROM and TEST MODES
1.0 SERIAL PORT
1.1 READ & WRITE REGISTERS
Figure 2. SPE is the Serial Port Enable. It goes high at the start of the transmission and goes back low at the end. SPC is the Serial Port Clock. It is stopped high when SPE is low (no transmission). SPD is the Serial Port Data. It is driven by the falling edge of SPC. It should be captured at the rising edge of SPC. The Read Register or Write Register command consists of 16 clocks or bit. A bit duration is the time between two falling edges of SPC. The first bit (bit 0) starts at the first falling edge of SPC after the rising edge of SPE and the last bit (bit 15) starts at the last falling edge of SPC just before the falling edge of SPE. ■ bit 0 : RW bit. When 0, the data (D7:0) is written into the device. When 1, the data (D7:0) from the device is read. In this case, the LIS1R02 will drive SPD at the start of bit 8. ■ bit 1-3 : chip ID. The chip ID for the LIS1R02 is ID(2:0)=110. The device accepts the command only when the ID is valid (equal to 110). ■ bit 4-7 : address AD(3:0). This is the address field for the registers. See section 2 for more details. ■ bit 8-15 : data D(7:0). This is the data that will be written (read) into (from) the register whose address is AD(3:0).
1.2 READ FIFO
Figure 3. The Read FIFO command consists of 24 clocks or bits. bit 0 : READ bit. The value is 1. bit 1-3 : chip ID. ID(2:0)=110. bit 4-7 : FIFO address. bit 8-23: FIFO data. SPE SPC SPD RW ID2 ID1 ID0 AD3 AD2 AD1 AD0 D7 D6 D5 D4 D3 D2 D1 D0 D00IN1119 SPE SPC SPD D00IN1120
LIS1R02 (L6671) The FIFO has four registers grouped into two banks. The first bank consists of the first and the second register. The first register is the one written first since the last read. The second bank consists of the third and fourth register. 0000: address for the first bank 0010: address for the second bank The device puts out first the data of the first register of the bank with the MSB first.
2.0 LIS1R02 REGISTERS
The registers are grouped into two banks. The following table summarizes their mapping.
2.1 Registers Bank 0
AD(3:0) = 0100 CTRL_Reg1 This is the first control register. It has 8 bit whose function is summarized below. Note: x means don't care value. Note: default value after Power On Reset is 0100 0000 1xxx xxxx Chip in Power Down mode xx00 xxxx Clock from CLK pin xx01 xxxx Clock derived from the internal oscillator xx10 xxxx Clock from the PLL locking on CLK_in xx11 xxxx Clock from the PLL locking on FIFO_Low reading xxxx 1xxx Internal Oscillator in Power Down mode Address Reg. Bank 0 Reg. Bank 1
0000 FIFO_Low FIFO_Low
0010 FIFO_High FIFO_High
0100 CTRL_Reg1 CTRL_Reg1
0101 CTRL_Reg2 CTRL_Reg2
0110 PLL_PRESC_MULT FLASH_Reg1
0111 PLL_MUL T FLASH_Reg2
1000 IIR_A0 GAIN_Low
1001 IIR_A1 GAIN_High
1010 IIR_A2 OFFSET_Low
1011 IIR_B1 OFFSET_High
1100 IIR_B2 CURR_BANDGAP
1101 IIR_SIGN_BIT BAND_CSACT_Reg
1110 DSC_Reg CS_TRIM
1111 MISC_Reg MISC_Reg
LIS1R02 (L6671) xxxx x001 Bitstream in mode. The bitstream is sent in via pin Funct_Test while the bitstream clock is sent via CLK_pin. The output can be checked via the serial interface. xxxx x010 Bistream out mode. The bitstream is sent out through pin SPD while the bitstream clock is sent through pin SPC. The pin TEST_ST must be tied to 1.5V. xxxx x011 Internal clock check mode. The decimation signal is sent out through pin SPD while the main clock can be checked through pin SPC. The pin TEST_ST must be tied to 1.5V. xxxx x100 Flash write mode xxxx x101 Flash read mode xxxx x11x Sensor trimming AD(3:0) = 0101 CTRL_Reg2 This is the second control register. It has 8 bit whose function is summarized below. Note: x means don't care value. Note: default value after Power On Reset is 0110 0011 0xxx xxxx Delayed Synchronous Conversion reference coming from CLK_pin/FIFO_Low reading signal. 1xxx xxxx Low rate Delayed Synchronous Conversion reference signal. x1xx xxxx Delayed Synchronous Conversion enabled. xx1x xxxx Clip on. The result of the measuring chain is clipped when exceding the maximum/minimum limit. xxx0 0xxx 8 bit output word length xxx0 1xxx 16 bit output word length xxx1 xxxx 32 bit output word length xxxx x1xx Bypass the embedded IIR filter xxxx xx0x Set the decimation factor to 16. 32 when the bit is 1. xxxx xxx0 Set the sinc order to 2. 3rd order when the bit is 1. AD(3:0) = 0110 PLL_PRESC_MULT This register contain the division factor used in the PLL prescaler and the most significant bit of the PLL multi- plication factor. AD(3:0) = 0111 PLL_PRESC_MULT This register contain the least significant bit of the PLL multiplication factor. AD(3:0) = 1000 IIR_A0 This register contain the A0 coefficient used in the embedded IIR register. AD(3:0) = 1001 IIR_A1 This register contain the A1 coefficient used in the embedded IIR register. AD(3:0) = 1010 IIR_A2 This register contain the A2 coefficient used in the embedded IIR register. AD(3:0) = 1011 IIR_B1 This register contain the B1 coefficient used in the embedded IIR register.
LIS1R02 (L6671) AD(3:0) = 1100 IIR_B2 This register contain the B2 coefficient used in the embedded IIR register. AD(3:0) = 1101 IIR_SIGN_BIT This register contain the sign bit of the coefficients used in the embedded IIR register. AD(3:0) = 1110 DSC_Reg This register contain the threshold value used to trigger the decimation when the Delayed Synchronous Con- version mode is enabled. AD(3:0) = 1111 MISC_Reg This is the miscellaneous register. Note: default value after Power On Reset is 0010 0000 1xxx 0x0x Force a SW reset. x1xx xx0x Enters PLL test mode. Bit 2-5 Define the internal oscillator division factor. xxxx xx01 Switch to Registers Bank 1.
2.2 Registers Bank 1
AD(3:0) = 0100 CTRL_Reg1 This is the second control register. AD(3:0) = 0101 CTRL_Reg2 This is the second control register. AD(3:0) = 0110 FLASH_REG1 This register is used to program the embedded memory. AD(3:0) = 0111 FLASH_REG1 This register is used to program the embedded memory. AD(3:0) = 1000 GAIN_Low These are the 8 LSB of gain for the adjustment unit. AD(3:0) = 1001 GAIN_High These are the 8 MSB of gain for the adjustment unit. AD(3:0) = 1010 OFFSET_Low These are the 8 LSB of offset for the adjustment unit. AD(3:0) = 1011 OFFSET_High These are the 8 MSB of offset for the adjustment unit.
LIS1R02 (L6671) AD(3:0) = 1100 CURR_BANDGAP This register is used for references trimming. AD(3:0) = 1101 BAND_CSACT_Reg This register is used for interface trimming and sensor actuation. AD(3:0) = 1110 CSTRIM_Reg This register is used for sensor trimming. AD(3:0) = 1111 MISC_Reg This is the miscellaneous register.
3.0 LIS1R02 COMPATIBILITY VERSUS L6670
Externally LIS1R02 presents the same pin-out of L6670. To have full compatibility with L6670 in terms of bitstream processing it is necessary to write the following con- figuration inside the LIS1R02 registers: CTRL_REG1: 0100 0000 CTRL_REG2: 0010 0111
LIS1R02 (L6671) SO24 DIM. mm inch A 2.35 2.65 0.093 0.104 A1 0.10 0.30 0.004 0.012 A2 2.55 0.100 B 0.33 0.51 0.013 0.0200 C 0.23 0.32 0.009 0.013 D 15.20 15.60 0.598 0.614 E 7.40 7.60 0.291 0.299 e 1.27 0,050 H 10.0 10.65 0.394 0.419 h 0.25 0.75 0.010 0.030 k 0˚ (min.), 8˚ (max.) L 0.40 1.27 0.016 0.050 Be A2 A 1324 D L H A1 C E K h x 45˚ SO24 Seating Plane 0.10mm .004 OUTLINE AND MECHANICAL DATA
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