Technical note TN8722.01 SX8722 operating modes Current consumption and timings ADVANCED COMMUNICATIONS & SENSING PRELIMINARY SX8722 operating modes Current consumption and timings Technical note TN8722.01 © 2007 Semtech Corp. www.semtech.com 1 Technical note TN8722.01 SX8722 operating modes Current consumption and timings ADVANCED COMMUNICATIONS & SENSING PRELIMINARY Table of Contents 1 1.1 1.2 1.3 2 2.1 2.2 2.2.1 2.2.2 2.2.3 2.2.4 2.2.5 2.3 2.3.1 2.3.2 2.3.3 3 3.1 3.2 3.2.1 3.2.2 3.2.3 3.2.4 3.2.5 3.3 3.3.1 3.3.2 3.3.3 3.3.4 4 4.1 4.2 4.2.1 4.2.2 4.2.3 4.2.4 4.2.5 4.3 4.3.1 4.3.2 4.3.3 4.3.4 4.3.5 5 5.1 5.2 5.3 5.4 6 7 7.1 Introduction ..................................................................................................................... 4 What is SX8722?.....................................................................................................................4 Documentation about the SX8722 ...........................................................................................4 SX8722 state diagram .............................................................................................................5 Active mode..................................................................................................................... 7 Description ..............................................................................................................................7 Operating specifications ..........................................................................................................7 Pin activity ...........................................................................................................................7 External 32k Xtal..................................................................................................................7 Internal voltage multiplier enabled below 3V VDD.................................................................7 2 I C communication ...............................................................................................................7 SX8722 current consumption ...............................................................................................8 How to set SX8722 in active mode ........................................................................................ 10 Start-up.............................................................................................................................. 10 From Sleep mode .............................................................................................................. 10 From Shutdown mode ........................................................................................................ 10 Sleep mode .................................................................................................................... 11 Description ............................................................................................................................ 11 Operating specifications of the sleep mode ............................................................................ 11 Summary ........................................................................................................................... 11 SX8722 sleep current consumption below 3V Vbat............................................................. 11 SX8722 sleep current consumption with the 32.768 kHz Xtal.............................................. 12 SX8722 sleep current consumption without the 32.768 KHz Xtal ........................................ 12 Current consumption measurements results....................................................................... 13 How to set SX8722 in sleep mode ......................................................................................... 14 2 I C sleep ............................................................................................................................ 14 SLEEP pin ......................................................................................................................... 14 Is SX8722 in SLEEP mode?............................................................................................... 14 Wake up from sleep mode to active mode .......................................................................... 15 Shutdown mode ............................................................................................................ 16 Description ............................................................................................................................ 16 Operating specifications in shutdown mode ........................................................................... 16 Summary ........................................................................................................................... 16 Internal voltage multiplier ................................................................................................... 16 Shutdown mode current consumption ................................................................................ 16 Current consumption measurements results....................................................................... 16 How to set shutdown mode consumption around 0.5µA...................................................... 17 How to set SX8722 in shutdown mode................................................................................... 18 2 I C Shutdown command..................................................................................................... 18 2 I C SHUT bit toggle ............................................................................................................ 18 SHUT pin ........................................................................................................................... 19 Wake-up from shutdown mode to active mode ................................................................... 19 Change from shutdown mode to sleep mode...................................................................... 19 Time specifications ....................................................................................................... 20 Time specification without the 32.768 kHz Xtal ...................................................................... 20 Start-up time with the 32.768 kHz Xtal presence .................................................................... 20 Changing mode by pin signal................................................................................................. 20 2 Changing mode by I C command .......................................................................................... 21 ANNEXE ......................................................................................................................... 22 TAPE & REEL SPECIFICATION..................................................................................... 23 MLP/QFN (0.70mm - 0.90mm package thickness) ................................................................. 23 © 2007 Semtech Corp. www.semtech.com 2 Technical note TN8722.01 SX8722 operating modes Current consumption and timings ADVANCED COMMUNICATIONS & SENSING PRELIMINARY Table of Figures Figure 1: SX8722 mode state diagram ........................................................................................ 5 Figure 2: pull-up resistor on I2C wire............................................................................................ 8 Figure 3: acquisition chain........................................................................................................... 9 Figure 4: I2C sequence to set in sleep mode............................................................................. 14 Figure 5: I2C sequence to wake up from sleep mode ................................................................ 14 Figure 6: I2C command to set in shutdown mode ...................................................................... 18 Figure 7: I2C sequence to set in shutdown mode ...................................................................... 18 Figure 8: start-up timing diagram with EEPROM loading ........................................................... 20 Figure 9: Direction of feed ......................................................................................................... 23 Figure 10: Tape and reel ........................................................................................................... 23 Table of Tables Table 1: Table 2: Table 3: Table 4: Table 5: Table 6: Table 7: PGA current consumption in [µA]................................................................................... 8 sleep mode current consumption ................................................................................. 13 shutdown mode current consumption .......................................................................... 16 changing mode timings by pin setting .......................................................................... 20 2 changing mode timings by I C command ..................................................................... 21 average current measurements ................................................................................... 22 Tape and reel dimensions ........................................................................................... 23 © 2007 Semtech Corp. www.semtech.com 3 Technical note TN8722.01 SX8722 operating modes Current consumption and timings ADVANCED COMMUNICATIONS & SENSING PRELIMINARY 1 Introduction This document is provided to you as a complement to the datasheet. It is a guideline to set up SX8722 in its different operating modes and sums up the corresponding current consumptions and timings. It is recommended to go though the datasheet first so as to have a detail description of SX8722 1.1 What is SX8722? SX8722 main function is analog signal acquisition from Wheatstone bridges or single ended sensors. The input can be a pressure sensor, a GMR or AMR magnetic sensor, a chemical sensor, a thermistor or a mix of several of these sensors. 2 SX8722 Sensor interface is totally configurable through an I C compatible interface. Several parameters are configurable through this interface such as alarms or signal post processing. SX8722 has three operating modes: • active mode • sleep mode • shutdown mode The different modes are controlled by the embedded program and these are described in this document. 1.2 Documentation about the SX8722 The following documents about SX8722 and the tools are also available: • SX8722 Datasheet • SX8722 Errata • XE8000EV120 Users Guide • XE8000EV120 Interfacing your first pressure sensor © 2007 Semtech Corp. www.semtech.com 4 Technical note TN8722.01 SX8722 operating modes Current consumption and timings ADVANCED COMMUNICATIONS & SENSING PRELIMINARY 1.3 SX8722 state diagram LOW POWER shutdown mode - Reset - Power on reset sleep mode - SHUT pin signal 2 - I C SHUTDOWN command - I2C SHUT bit toggle - Reset - sleep pin signal - I2C SLEEP bit toggle - Power on reset start-up from sleep sleep sequence ACTIVE start-up from shut shutdown sequence - SLEEP pin signal - I2C SLEEP bit toggle active mode Figure 1: SX8722 mode state diagram © 2007 Semtech Corp. www.semtech.com 5 - SHUTDOWN pin signal - I2C SHUTDOWN command - I2C SHUT bit toggle Technical note TN8722.01 SX8722 operating modes Current consumption and timings ADVANCED COMMUNICATIONS & SENSING PRELIMINARY The transition states: Start-up from shutdown: - Initializes the SX8722 - Load EEPROM if present - Restores EEPROM configuration and set the SX8722 Start-up from sleep: - Restores the RC active value - Enables VLD - Restores SX8722 configuration saved in RAM Sleep sequence: - Waits for I C STOP sequence - Stops the ADC - Disable VLD - Bias current off - Set the clock to RC minimum value or to Xtal if present - asm “HALT” Shutdown sequence: - Waits for I2C STOP sequence - Stops the ADC - Disable VLD - Bias current off - Stops the SX8722 2 The timing of the transition states depends mainly on the Xtal presence, the EEPROM presence and 2 if the transition is caused by an I C command or by a pin signal (SLEEP, SHUT, RESET). See time specification chapter in this document and SX8722 datasheet for more information. © 2007 Semtech Corp. www.semtech.com 6 Technical note TN8722.01 SX8722 operating modes Current consumption and timings ADVANCED COMMUNICATIONS & SENSING PRELIMINARY 2 Active mode In this chapter you will find: • The description of the active mode • The operating specifications • How to set SX8722 in active mode 2.1 Description In active mode, SX8722 and all its peripherals can work and execute the embedded program. The acquisition chain, the alarms and the signal post processing can be activated and parameterized. 2.2 Operating specifications 2.2.1 Pin activity SX8722 generates pulses on the pin READY in active mode. At 1.8 MHz RC with the external 32.768 kHz Xtal, a pulse of 3µs occurs every 36ms.. The READY pin generates a single signal used to interrupt the host microcontroller when a new sample value is available on SX8722 output register. This signal can be used to verify that SX8722 is in active mode. 2.2.2 External 32k Xtal If there is no external Xtal and if no calibration is needed, the CAL pin must be connected to Vss for SX8722 to operate. If there is an external Xtal, the CAL pin must be connected to Vbat. 2.2.3 Internal voltage multiplier enabled below 3V VDD An internal voltage multiplier (VMULT) is automatically enabled when the power supply goes below TM 3 Volts to power the ZoomingADC , and this internal voltage multiplier requires an external capacitor from the VMULT pin to the ground. The value of this capacitor must be between 1 and 3nF. 2.2.4 I2C communication 2 10kΩ pull up resistors are necessary on SCL and SDA as mentioned in the I C protocol specification. Pull-up resistors on EE_SDA and EE_SCL pins are necessary for EEPROM communication too. The SDA and SCL IO are open collectors when waiting for communication. EE_SDA and EE_SCL are grounded. In this case SX8722 is the master and these signals are active only at start-up to load a configuration or when a SAVE/LOAD EEPROM command is received by the SX8722. © 2007 Semtech Corp. www.semtech.com 7 Technical note TN8722.01 SX8722 operating modes Current consumption and timings ADVANCED COMMUNICATIONS & SENSING PRELIMINARY The EEPROM is powered by the EE_POWER pin of SX8722 only VBAT 10 kΩ pull up resistors SX8722 VBAT VBAT CAL EE_POWER 10 kΩ pull up resistors Supply I2C Slave EEPROM I2C Slave SDA I2C Master I2C Master EE_SCL VREG EE_SDA VMULT BIAS SDA Port In READY SCL SDA SCL SCL Host µC GND GND 1µF 2nF 2 Figure 2: pull-up resistor on I C wire 2.2.5 SX8722 current consumption SX8722 mean current consumption in active mode is around 200 [µA], without enabled PGA. The value of the gain of de PGA can have a negligible influence on consumption in active mode. Additional consumption depends on the active PGA and on the bias current parameter. bias 25% bias 50% bias 75% bias 100% IPGA1 [µA] 50 95 140 185 IPGA2 [µA] 40 75 110 145 IPGA3 [µA] 50 98 145 190 Table 1: PGA current consumption in [µA] © 2007 Semtech Corp. www.semtech.com 8 Technical note TN8722.01 SX8722 operating modes Current consumption and timings ADVANCED COMMUNICATIONS & SENSING fS AC MUX Inputs 0 1 2 3 4 5 6 7 fS PGA1 PGA2 0 1 2 3 MUX Off. 2 AR PRELIMINARY PGA3 Off. 3 V REF Figure 3: acquisition chain 2.2.5.1 Example 1 Bias current: 25% PGA1: enabled PGA2: enabled PGA3: enabled SX8722 measured current consumption: ~330 µA 2.2.5.2 Example 2 Bias current: 100% PGA1: enabled PGA2: enabled PGA3: enabled SX8722 measured current consumption: ~710 µA © 2007 Semtech Corp. www.semtech.com 9 ADC Measurement engine Technical note TN8722.01 SX8722 operating modes Current consumption and timings ADVANCED COMMUNICATIONS & SENSING 2.3 How to set SX8722 in active mode 2.3.1 Start-up At start-up SX8722 is automatically set in active mode. If there is no EEPROM configuration loaded at start-up, PGA are not active. 2.3.2 From Sleep mode • • • • Positive pulse on RESET pin Negative pulse on the SLEEP pin 2 SLEEP bit toggle in the SXCtrl1 register (I C write mask command) Other interruption 2.3.3 From Shutdown mode • • Positive pulse on RESET pin Power-on-reset (negative pulse on VBAT pin) © 2007 Semtech Corp. www.semtech.com 10 PRELIMINARY Technical note TN8722.01 SX8722 operating modes Current consumption and timings ADVANCED COMMUNICATIONS & SENSING PRELIMINARY 3 Sleep mode In this chapter you will find: • The description of the sleep mode • The operating specifications in sleep mode • How to set SX8722 in sleep mode 3.1 Description 2 The sleep mode is a low power mode. It can be called by an I C sequence or by sending a negative pulse to SX8722 SLEEP pin. 3.2 Operating specifications of the sleep mode 3.2.1 Summary • • • • • • • SX8722 configuration saved in RAM ADC stopped VLD stopped (voltage level detector) If Xtal present, clock set to Xtal 32k If Xtal not present, clock set to RC minimum value (~80kHz) Bias current off 2 Program HALT, SX8722 needs an interrupt to wake up (I C communication, SLEEP pin signal, reset, etc). 3.2.2 SX8722 sleep current consumption below 3V Vbat Below 3 Volts SX8722 enables the internal voltage multiplier to power the ZoomingADC™. This internal voltage multiplier is automatically enabled when the power supply goes below 3V Vbat. This voltage multiplier increases SX8722 consumption. This is why the chip consumption in sleep mode with 2.5V supply is higher than with 5.5V supply. There is a possibility to consume less current when the Vbat voltage is lower than 3V: the SLEEP signal has to be sent to the SLEEP pin when Vbat is higher than 3V, and then decrease the Vbat value. In this case, the voltage multiplier is not activated. © 2007 Semtech Corp. www.semtech.com 11 Technical note TN8722.01 SX8722 operating modes Current consumption and timings ADVANCED COMMUNICATIONS & SENSING PRELIMINARY 3.2.3 SX8722 sleep current consumption with the 32.768 kHz Xtal The sleep mode current consumption with the presence of the 32.768 kHz Xtal is around 1µA if the supply voltage is above 3V. Below 3V, the current consumption is around 4 µA because the VMULT is enabled. In addition to set the precise RC frequency, the presence of an external 32.768 kHz Xtal allows SX8722 sleep current consumption 3x lower than without the Xtal. In this case SX8722 main clock is generated by the Xtal. 3.2.4 SX8722 sleep current consumption without the 32.768 KHz Xtal The current consumption in sleep mode without the 32.768 kHz Xtal is around 3 µA if the supply voltage is above 3V. Below 3V, the current consumption is around 9 µA because the voltage multiplier is enabled. The RC min frequency is set and its value is around 80 kHz. © 2007 Semtech Corp. www.semtech.com 12 Technical note TN8722.01 SX8722 operating modes Current consumption and timings ADVANCED COMMUNICATIONS & SENSING PRELIMINARY 3.2.5 Current consumption measurements results Vbat [V] 2.5 5.5 Temp. [°C] -40 25 85 ISLEEP [µA] 7.69 8.792 9.536 ISLEEP [µA] 2.69 2.844 2.976 (1) ISLEEP [µA] with Xtal 3.028 3.864 4.362 -40 25 85 2.84 3.024 3.196 6.58 7.538 8.146 0.998 1.074 1.292 ISLEEP [µA] with Xtal 0.988 1.062 1.264 3.28 4.158 4.426 Table 2: sleep mode current consumption (1) Indirect measurement: the SLEEP signal is sent on SLEEP pin, and then the Vbat voltage is changed. The 5.5V orange cases have not real application. The voltage multiplier is forced on. As indicated in the table, the sleep mode current consumption is around 3 times lower with a Xtal presence. © 2007 Semtech Corp. www.semtech.com 13 (1) Technical note TN8722.01 SX8722 operating modes Current consumption and timings ADVANCED COMMUNICATIONS & SENSING PRELIMINARY 3.3 How to set SX8722 in sleep mode 3.3.1 I2C sleep Through the I2C interface, send a write mask command at address 00 and toggle the SLEEP bit of the SXCtrl1 register. I2C SEQUENCE: 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 ACK 0 STOP 0 ACK 0 Mask 0x04 ACK 1 ACK 0 R/W 1 START 0 Data 0x04 Memory address 0x00 Command 0x20 ACK Slave address 0x48 Figure 4: I2C sequence to set in sleep mode When SX8722 is in sleep mode, send a write mask command at address 00 and toggle the SLEEP bit to restore SX8722 active mode. I2C SEQUENCE: 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 ACK 0 Figure 5: I2C sequence to wake up from sleep mode 2 WARNING: The I C SLEEP command does not allow reaching as low current consumption as the SLEEP pin command or writing the SXCtrl1 register SLEEP bit. The sleep mode called by I2C SLEEP command (0x40) has a current consumption around 80µA. 3.3.2 SLEEP pin Put the SLEEP input signal to VSS, the SLEEP input is active on negative edge. 3.3.3 Is SX8722 in SLEEP mode? There are pulses on the READY pin in active mode every 36ms. In sleep mode there is no pulse on the READY pin. © 2007 Semtech Corp. www.semtech.com 14 STOP 0 ACK 1 Mask 0x04 ACK 0 ACK 1 R/W START 0 Data 0x00 Memory address 0x00 Command 0x20 ACK Slave address 0x48 Technical note TN8722.01 SX8722 operating modes Current consumption and timings ADVANCED COMMUNICATIONS & SENSING PRELIMINARY 3.3.4 Wake up from sleep mode to active mode In sleep mode the internal program is in “HALT” assembler equivalent mode. The SLEEP bit toggling in SXCtrl1 or a signal on the SLEEP pin can wake up the SX8722. See active mode section for more information. © 2007 Semtech Corp. www.semtech.com 15 Technical note TN8722.01 SX8722 operating modes Current consumption and timings ADVANCED COMMUNICATIONS & SENSING PRELIMINARY 4 Shutdown mode In this chapter you will find: • The description of the shutdown mode • The operating specifications • How to set SX8722 in shutdown mode 4.1 Description This is a very low-power mode because all circuit clocks and all peripherals are stopped. Only some service blocks remain active. 4.2 Operating specifications in shutdown mode 4.2.1 Summary • • • • • • • ADC stopped VLD stopped If Xtal present, clock set to Xtal 32k If Xtal not present, clock set to RC minimum value (~80kHz) Bias current off Program HALT, interrupt off 2 No possible I C communication. 4.2.2 Internal voltage multiplier Like in sleep mode, internal voltage multiplier is automatically enabled when the power supply goes below 3 Volts but the internal voltage multiplier requires an external capacitor between VMULT pin and Vss, the value of this capacitor must be between 1 and 3nF. 4.2.3 Shutdown mode current consumption The current consumption in shutdown mode is around 0.5 µA if the supply voltage is above 3V. Below 3V, the current consumption is around 3.5 µA because the voltage multiplier is enabled. 4.2.4 Current consumption measurements results voltage [V] temperature [°C] -40 2.5 25 85 5.5 -40 25 85 (1) ISHUT [µA] 2.6 3.478 3.628 ISHUT [µA] 0.492 0.53 0.69 0.5 0.54 0.73 2.85 3.63 3.538 Table 3: shutdown mode current consumption © 2007 Semtech Corp. www.semtech.com 16 Technical note TN8722.01 SX8722 operating modes Current consumption and timings ADVANCED COMMUNICATIONS & SENSING PRELIMINARY (1) Indirect measurement: at first, the signal command is set on the SHUTDOWN pin, and then the supply voltage is changed, from 5.5V to 2.5V or from 2.5V to 5.5V. The 5.5V orange cases have not real application. The voltage multiplier is forced on. 4.2.5 How to set shutdown mode consumption around 0.5µA By default, with a supply voltage below 3V the shutdown mode current is around 3.5µA. To obtain 0.5µA consumption, the shut command (I2C, pin) has to be received by the SX8722 when the internal voltage multiplier is not enabled. It means when the supply voltage is above 3V. Then, if the supply voltage is lowered under 3V, the SX8722 will conserve the 0.5µA consumption. © 2007 Semtech Corp. www.semtech.com 17 Technical note TN8722.01 SX8722 operating modes Current consumption and timings ADVANCED COMMUNICATIONS & SENSING PRELIMINARY 4.3 How to set SX8722 in shutdown mode 4.3.1 I2C Shutdown command Send the 0x50 command through the I2C interface. I2C SEQUENCE: 0 0 0 0 0 0 1 0 1 0 0 0 0 0 ACK 1 STOP 0 R/W 1 START 0 Command 0x50 ACK Slave address 0x48 Figure 6: I2C command to set in shutdown mode 4.3.2 I2C SHUT bit toggle 2 Through the I C interface, send a write mask command at address 00 and toggle the SHUT bit of the SXCtrl1 register. I2C SEQUENCE: 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 Figure 7: I2C sequence to set in shutdown mode © 2007 Semtech Corp. www.semtech.com 18 0 0 0 0 0 0 1 0 0 ACK 0 STOP 0 Mask 0x02 ACK 1 ACK 0 ACK 1 R/W START 0 Data 0x02 Memory address 0x00 Command 0x20 ACK Slave address 0x48 Technical note TN8722.01 SX8722 operating modes Current consumption and timings ADVANCED COMMUNICATIONS & SENSING PRELIMINARY 4.3.3 SHUT pin Put the SHUT input signal to VSS, the SHUT input is active on negative edge. 4.3.4 Wake-up from shutdown mode to active mode There are two possible ways to wake-up from the shutdown mode: • • The POR (power-on-reset caused by a power-down followed by power-on). The RESET pin. In both case the RAM information is lost. SX8722 configuration must be restored from the EEPROM saved configuration. 4.3.5 Change from shutdown mode to sleep mode This is not possible. © 2007 Semtech Corp. www.semtech.com 19 Technical note TN8722.01 SX8722 operating modes Current consumption and timings ADVANCED COMMUNICATIONS & SENSING PRELIMINARY 5 Time specifications In this chapter you will find: • The start-up time specification of the SX8722. • The time values to change the mode of SX8722 with the 32k Xtal presence 5.1 Time specification without the 32.768 kHz Xtal The internal SX8722 RC oscillator accuracy depends on technology tolerance. It can reach ± 50% difference from one chip to another In this case, and if no calibration is done, the clock is centred around 1.2 MHz. SX8722 timing values without Xtal can thus differ of ± 50% to these with a Xtal. 5.2 Start-up time with the 32.768 kHz Xtal presence The mean time of EEPROM loading at the start-up is 140 ms if configuration data are saved in. In this case SX8722 will provide the first sample after 180ms. time before EEPROM loading: 7.5 [ms] time after EEPROM loading: 140 [ms] time to have the first sample: 180 [ms] SX8722 Power-on t EEPROM loading t Sample available t Figure 8: start-up timing diagram with EEPROM loading 5.3 Changing mode by pin signal ↓To \ From → SHUT SLEEP ACTIVE SHUT inst. (1) SLEEP 640 ms inst. ACTIVE 650 ms 660 ms (1) Table 4: changing mode timings by pin setting © 2007 Semtech Corp. www.semtech.com 20 Technical note TN8722.01 SX8722 operating modes Current consumption and timings ADVANCED COMMUNICATIONS & SENSING PRELIMINARY 2 5.4 Changing mode by I C command ↓To \ From → SHUT SLEEP ACTIVE SHUT SLEEP 700 µs inst. ACTIVE 700 µs 470 µs (1) 2 Table 5: changing mode timings by I C command (1) instantaneous We consider the ACTIVE mode as NOT low power mode. When time to change mode is instantaneous, it doesn't means that the chip is totally ready to work. There are for examples initialization times, EEPROM loading or code execution. We consider the transition time as not low power. © 2007 Semtech Corp. www.semtech.com 21 Technical note TN8722.01 SX8722 operating modes Current consumption and timings ADVANCED COMMUNICATIONS & SENSING PRELIMINARY 6 ANNEXE In this chapter you will find: • The average result of SX8722 current measurements. Vdd [V] 2.5 5.5 temperature [°C] -40 25 85 ISLEEP [µA] 7.69 8.792 9.536 ISLEEP [µA] 2.69 2.844 2.976 (1) ISLEEP [µA] with XTAL 3.028 3.864 4.362 ISLEEP [µA] with XTAL(1) 0.988 1.062 1.264 ISHUT [µA] 2.6 3.478 3.628 ISHUT [µA] 0.492 0.53 0.69 (1) IACTIVE [µA] 176.6 205.8 227.1 (2) -40 25 85 2.84 3.024 3.196 6.58 7.538 8.146 0.998 1.074 1.292 3.28 4.158 4.426 0.5 0.54 0.73 2.85 3.63 3.538 178.8 212.8 233.8 Table 6: average current measurements (1) Indirect measurement: at first, the signal command is set on the pin, and then the supply voltage is changed. The 5.5V orange cases have not real application. The voltage multiplier is forced on. (2) The measurements are done without activating the PGAs. © 2007 Semtech Corp. www.semtech.com 22 Technical note TN8722.01 SX8722 operating modes Current consumption and timings ADVANCED COMMUNICATIONS & SENSING PRELIMINARY 7 TAPE & REEL SPECIFICATION 7.1 MLP/QFN (0.70mm - 0.90mm package thickness) • • • • • • Single Sprocket holes Tolerances for Ao & Bo are +/- 0.20mm Tolerances for Ko is +/- 0.10mm Tolerance for Pocket Pitch is +/- 0.10mm Tolerance for Tape width is +/-0.30mm Package Orientation and Feed Direction Figure 9: Direction of feed Figure 10: Tape and reel Pkg size 8x8 carrier tape (mm) Tape Width (W) 16 Pocket Pitch (P) 12 Reel Ao Bo Ko 8.30 8.30 1.10 Reel Size (in) 13 Reel Width (mm) 16.4 Trailer Length (mm) 400 Leader Length (mm) 400 QTY per Reel 3000 Table 7: Tape and reel dimensions © 2007 Semtech Corp. www.semtech.com 23 Technical note TN8722.01 SX8722 operating modes Current consumption and timings ADVANCED COMMUNICATIONS & SENSING PRELIMINARY © Semtech 2007 All rights reserved. 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