Wearable Devices with RE01
Renesas' reference design for wearable devices can reduce processing by half for extended battery life
Wearable devices are getting smarter and more power-hungry due to the requirement of more CPU processing for digital signal processing such as voice recognition. The added signal processing causes an increase in the current consumed by even Renesas' ultra-low power RE01 CPU affecting the battery life. Since the battery size of wearable devices is generally quite small (i.e., 120 mAh), this winning combo reference design replaces the RE01 MCU's internal LDOs with external ISL9123 buck regulators. With this reference design, the RE01 CPU processing current can be reduced by half and directly contributes to extended battery life.
Features
System Benefits
- The ultra-low IQ ISL9123 buck regulator enables extended battery life of wearable devices that require very heavy CPU processing for features such as voice recognition
- ISL29125 light sensor controls the brightness of the backlight
- The READ2302 op amp amplitudes the output of the MEMS microphone to detect the voice from the RE01 14-bit ADC
- The ISL9205 battery charger charges the Li-ion battery
MCU
| Image | Manufacturer Part Number | Description | Core Size | Speed | Connectivity | Available Quantity | Price | View Details | |
|---|---|---|---|---|---|---|---|---|---|
 |  | R7F0E01182CFP#AA0 | IC MCU 32BIT 256KB FLSH 100LFQFP | 32-Bit | 64MHz | I2C, IrDA, SCI, SPI, UART/USART, USB | 0 - Immediate | $10.01 | View Details |
|  | R5F11AGGANB#20 | IC MCU 16BIT 128KB FLASH 48HWQFN | 16-Bit | 32MHz | CSI, I2C, UART/USART | 0 - Immediate | $5.26 | View Details |
| | R5F11AGGDNB#20 | IC MCU 16BIT 128KB FLASH 48HWQFN | 16-Bit | 32MHz | CSI, I2C, UART/USART | 0 - Immediate | $5.38 | View Details |
Power
| Image | Manufacturer Part Number | Description | Available Quantity | Price | View Details | |
|---|---|---|---|---|---|---|
|  | ISL9205DIRZ | IC BATT CHG LI-ION 1CELL 10DFN | 0 - Immediate | $2.06 | View Details |
|  | ISL9205IRZ | IC BATT CHG LI-ION 1CELL 16QFN | 100 - Immediate | View Details for Pricing | View Details |
| | ISL9205BIRZ | IC BATT CHG LI-ION 1CELL 10DFN | 0 - Immediate | View Details for Pricing | View Details |
| | ISL9205IRZ-T | IC BATT CHG LI-ION 1CELL 16QFN | 0 - Immediate | $2.25 | View Details |
|  | ISL9123IRC-EVZ | EVAL BOARD FOR ISL9123 | 0 - Immediate | View Details for Pricing | View Details |
|  | ISL88002IH29Z-TK | IC SUPERVISOR 1 CHANNEL SOT23-3 | 0 - Immediate | $1.55 | View Details |
|  | ISL88002IE26Z-T7A | IC SUPERVISOR 1 CHANNEL SC70-3 | 0 - Immediate | $1.82 | View Details |
| | ISL88002IH29Z-T7A | IC SUPERVISOR 1 CHANNEL SOT23-3 | 9 - Immediate | $1.67 | View Details |
| | ISL88002IH26Z-TK | IC SUPERVISOR 1 CHANNEL SOT23-3 | 15 - Immediate | $1.70 | View Details |
|  | HS3001 | SENSOR HUMIDITY 90% RH SMD | 0 - Immediate | View Details for Pricing | View Details |
Analog
| Image | Manufacturer Part Number | Description | Output Type | Gain Bandwidth Product | Current - Input Bias | Available Quantity | Price | View Details | |
|---|---|---|---|---|---|---|---|---|---|
|  | READ2302GSP#GC3 | IC CMOS 2 CIRCUIT 8TSSOP | - | 6 MHz | 1 pA | 657 - Immediate | $1.32 | View Details |
Published: 2021-03-09
