C8051F988-GM Silicon Laboratories Inc, C8051F988-GM Datasheet - Page 195
![IC MCU 8BIT 4KB FLASH 24QFN](/photos/12/15/121587/c8051f9xx_24-qfn_sml.jpg)
C8051F988-GM
Manufacturer Part Number
C8051F988-GM
Description
IC MCU 8BIT 4KB FLASH 24QFN
Manufacturer
Silicon Laboratories Inc
Series
C8051F9xxr
Specifications of C8051F988-GM
Program Memory Type
FLASH
Program Memory Size
4KB (4K x 8)
Package / Case
24-UQFN Exposed Pad, 24-HUQFN
Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
17
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Data Converters
A/D 10x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Processor Series
C8051F9x
Core
8051
Data Ram Size
512 B
Interface Type
I2C, SMBus, Enhanced UART, Enhanced SPI
Maximum Clock Frequency
7 KHz
Number Of Programmable I/os
17
Number Of Timers
4
Operating Supply Voltage
2.4 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Development Tools By Supplier
C8051F996DK
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 10 Channel
On-chip Dac
10 bit, 4 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1959-5
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20. SmaRTClock (Real Time Clock)
C8051F99x-C8051F98x devices include an ultra low power 32-bit SmaRTClock Peripheral (Real Time
Clock) with alarm. The SmaRTClock has a dedicated 32 kHz oscillator that can be configured for use with
or without a crystal. No external resistor or loading capacitors are required. The on-chip loading capacitors
are programmable to 16 discrete levels allowing compatibility with a wide range of crystals. The SmaRT-
Clock can operate directly from a 1.8–3.6 V battery voltage and remains operational even when the device
goes into its lowest power down mode. The SmaRTClock output can be buffered and routed to a GPIO pin
to provide an accurate, low frequency clock to other devices while the MCU is in its lowest power down
mode (see “PMU0MD: Power Management Unit Mode” on page 168 for more details). C8051F99x-
C8051F98x devices also support an ultra low power internal LFO that reduces sleep mode current.
The SmaRTClock allows a maximum of 36 hour 32-bit independent time-keeping when used with a
32.768 kHz Watch Crystal. The SmaRTClock provides an Alarm and Missing SmaRTClock events, which
could be used as reset or wakeup sources. See Section “18. Reset Sources” on page 179 and Section
“15. Power Management” on page 161 for details on reset sources and low power mode wake-up sources,
respectively.
XTAL4
Registers
Programmable Load Capacitors
Internal
SmaRTClock State Machine
SmaRTClock Oscillator
SmaRTClock
Figure 20.1. SmaRTClock Block Diagram
CAPTUREn
RTC0XCN
RTC0XCF
ALARMn
RTC0CN
XTAL3
Wake-Up
Interrupt
Rev. 1.0
RTCOUT
RTC0KEY
RTC0ADR
RTC0DAT
Registers
Interface
C8051F99x-C8051F98x
SmaRTClock
32-Bit
Timer
LFO
Power/
Clock
Mgmt
195
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