SI1011-A-GM Silicon Laboratories Inc, SI1011-A-GM Datasheet - Page 153

• Manufacturer Part Number: SI1011-A-GM
• Description: IC TXRX MCU + EZRADIOPRO
• Manufacturer: Silicon Laboratories Inc

Specifications of SI1011-A-GM

• Package / Case: 42-QFN
• Frequency: 240MHz ~ 960MHz
• Data Rate - Maximum: 256kbps
• Modulation Or Protocol: FSK, GFSK, OOK
• Applications: General Purpose
• Power - Output: 20dBm
• Sensitivity: -121dBm
• Voltage - Supply: 1.8 V ~ 3.6 V
• Current - Receiving: 18.5mA
• Current - Transmitting: 85mA
• Data Interface: PCB, Surface Mount
• Memory Size: 8kB Flash, 768B RAM
• Antenna Connector: PCB, Surface Mount
• Number Of Receivers: 1
• Number Of Transmitters: 1
• Wireless Frequency: 240 MHz to 960 MHz
• Interface Type: UART, SMBus, SPI, PCA
• Output Power: 20 dBm
• Operating Supply Voltage: 0.9 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Maximum Supply Current: 4 mA
• Minimum Operating Temperature: - 40 C
• Modulation: FSK, GFSK, OOK
• Protocol Supported: C2, SMBus
• Core: 8051
• Program Memory Type: Flash
• Program Memory Size: 8 KB
• Data Ram Size: 768 B
• Supply Current (max): 4 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Operating Temperature: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1872-5

13.6. Minimizing Flash Read Current
The Flash memory in the Si1010/1/2/3/4/5 devices is responsible for a substantial portion of the total digital
supply current when the device is executing code. Below are suggestions to minimize Flash read current.
1. Use idle, suspend, or sleep modes while waiting for an interrupt, rather than polling the interrupt flag.
2. Si1010/1/2/3/4/5 devices have a one-shot timer that saves power when operating at system clock
3. Flash read current depends on the number of address lines that toggle between sequential Flash read
4. The Flash memory is organized in rows of 64 bytes. A substantial current increase can be detected
5. To minimize the power consumption of small loops, it is best to locate them within a single row, if
6. To write software that is compatible with all devices in the ‘F93x-’F92x and ‘F91x-’F90x product families,
Idle Mode is particularly well-suited for use in implementing short pauses, since the wake-up time is no
more than three system clock cycles. See the Power Management chapter for details on the various
low-power operating modes.
frequencies of 14 MHz or less. The one-shot timer generates a minimum-duration enable signal for the
Flash sense amps on each clock cycle in which the Flash memory is accessed. This allows the Flash to
remain in a low power state for the remainder of the long clock cycle.
At clock frequencies above 14 MHz, the system clock cycle becomes short enough that the one-shot
timer no longer provides a power benefit. Disabling the one-shot timer at higher frequencies reduces
power consumption. The one-shot is enabled by default, and it can be disabled (bypassed) by setting
the BYPASS bit (FLSCL.6) to logic 1. To re-enable the one-shot, clear the BYPASS bit to logic 0.
operations. In most cases, the difference in power is relatively small (on the order of 5%).
when the read address jumps from one row in the Flash memory to another. Consider a 3-cycle loop
(e.g., SJMP $, or while(1);) which straddles a Flash row boundary. The Flash address jumps from one
row to another on two of every three clock cycles. This can result in a current increase of up 30% when
compared to the same 3-cycle loop contained entirely within a single row.
possible. To check if a loop is contained within a Flash row, divide the starting address of the first
instruction in the loop by 64. If the remainder (result of modulo operation) plus the length of the loop is
less than 63, then the loop fits inside a single Flash row. Otherwise, the loop will be straddling two
adjacent Flash rows. If a loop executes in 20 or more clock cycles, then the transitions from one row to
another will occur on relatively few clock cycles, and any resulting increase in operating current will be
negligible.
the Flash row size should be considered 64 bytes.
Rev. 1.0
Si1010/1/2/3/4/5
153